Home Physical Sciences The crystal structure of 6-hydroxy-5H-pyrrolo[3,4-b]pyridine-5,7(6H)-dione monohydrate, C7H6N2O4
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The crystal structure of 6-hydroxy-5H-pyrrolo[3,4-b]pyridine-5,7(6H)-dione monohydrate, C7H6N2O4

  • Feng Xu ORCID logo EMAIL logo , Hui Yu and Shilin Zheng
Published/Copyright: September 23, 2025
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Zeitschrift für Kristallographie - New Crystal Structures
From the journal Zeitschrift für Kristallographie - New Crystal Structures Volume 240 Issue 6

Abstract

C7H6N2O4, monoclinic, P21/c (no. 14), a = 8.1416(3) Å, b = 10.2220(3) Å, c = 9.2212(3) Å, β = 91.7600(10)°, V = 767.06(4) Å3, Z = 15, R gt (F) = 0.1022, wRref(F2) = 0.1077, T = 296.15 K.

CCDC no.: 2469492

The molecular structure is shown in the figure. Table 1 contains the crystallographic data and the list of the atoms including atomic coordinates and displacement parameters can be found in the cif-file attached to this article.

Table 1:

Data collection and handling.

Crystal: Colourless block
Size: 0.20 × 0.15 × 0.10 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 0.13 mm−1
Diffractometer, scan mode: Bruker Apex2, φ and ω scan
θmax, completeness: 27.6°, 100 %
N(hkl)measured, N(hkl)unique, Rint: 12460, 1,776, 0.020
Criterion for Iobs, N(hkl)gt: Iobs > 2 σ(Iobs), 1573
N(param)refined: 130
Programs: Olex2, 1 SHELX, 2 , 3 Bruker 4

1 Source of materials

All chemicals were purchased from commercial sources and used as received without further purification, and 2,3-pyridinedicarboxylic anhydride was synthesized by our laboratory. Under N2, anhydrous sodium acetate (3.956 g, 48.2 mmol) and hydroxylamine hydrochloride (3.956 g, 57.1 mmol) were dissolved in acetic acid (25 mL). Then, the above mixture solution was refluxed for 5 min. The mixture was filtered to remove precipitated NaCl. And then, 2,3-pyridinedicarboxylic anhydride (3.956 g, 26.6 mmol) was added to the filtrate, and the mixture was refluxed for 25 min. After completion, the mixture was filtered and concentrated to a saturated solution under vacuum, a yellow precipitate is formed. The precipitate was collected by filtration, washed with diethyl ether. The crystals were obtained by recrystallization in the cooled acetonitrile solution. 1H NMR (400 MHz, DMSO‑d6) δ: 11.04 (s, 1H) 8.94 (m, 1H), 8.24 (m, 1H), 7.77 (m, 1H). 13C NMR (101 MHz, DMSO‑d6) δ: 162.66, 154.58, 149.01, 130.96, 128.03, 125.32.

2 Experimental details

Olex2 1 software and the SHELXL 2 refinement were used to solve and refine the crystal structure. Hydrogen atoms were placed in their geometrically idealized positions and constrained to ride on their parent atoms.

3 Comment

Organic nitrogen hydroxy compounds (N–OH), as a novel class of organic catalysts, with N-hydroxyphthalimide (NHPI) being the most representative, have recently been employed as an effective system for C–H bonds activation via hydrogen extraction. 5 , 6 , 7 , 8 , 9 The molecule features the unique properties of the N–OH function which is different from the previously proposed systems. 10 , 11 Thus, organic nitrogen hydroxy compounds have attracted increasing interest from both the academic and industrial communities over the past decade. 12 These compounds primarily achieve classical C–H bond oxidation reactions through the homolytic cleavage of the hydroxyl bond in N–OH to form N-oxyl radical. 13 , 14 , 15 As a result, this kind of compound has a wide range of applications in carbon-carbon, carbon-nitrogen, and carbon-silicon bond formation reactions. 12 With the continuous in-depth research on the synthesis and application of organic nitrogen hydroxy compounds, exploring the structural characteristics of these compounds is of great significance for understanding their structure-activity relationships.

However, reports on the crystal structures of organic nitrogen hydroxy compounds remain limited. To date, only two classes of symmetrical organic nitrogen hydroxyl compounds have been reported, i.e., HPPDO 16 and DNHPI. 17

The molecular structure comprises at least two distinct planes: the pyridine ring plane, the pyrrole ring plane. In the crystal, the torsion angles of the nitrogen hydroxyl group (angle N(1)–O(4)H) is 106.8°. The O–H bond length in the nitrogen hydroxyl group is 0.95 Å, which is longer than the O–H bond length in water molecules (0.85 Å). Additionally, the hydrogen in the nitrogen hydroxyl group can form hydrogen bonds with water molecules, which are present. All geometric parameters fall within expected ranges. 16 , 17

Corresponding author: Feng Xu, School of Materials Science, Guiyang University, Guiyang 550005, Guizhou Province, P.R. China, E-mail:

Hui Yu and Feng Xu contributed to the work equally and should be regarded as co-first authors.

Funding source: Guiyang University Multidisciplinary Team Construction Projects in 2025

Award Identifier / Grant number: Gyxk202505

Funding source: Research Fund of Guizhou Provincial Department of Education

Award Identifier / Grant number: Qianjiaoji[2024]284

  1. Research funding: We gratefully acknowledge support by the Guiyang University Multidisciplinary Team Construction Projects in 2025 [Gyxk202505] and Research Fund of Guizhou Provincial Department of Education (No. Qianjiaoji[2024]284).

References

1. Dolomanov, O. V.; Bourhis, L. J.; Gildea, R. J.; Howard, J. A. K.; Puschmann, H. Olex2: A Complete Structure Solution, Refinement and Analysis Program. J. Appl. Cryst. 2009, 42, 339–341; https://doi.org/10.1107/s0021889808042726.Search in Google Scholar

2. Sheldrick, G. M. Shelxtl – Integrated Space-Group and Crystal-Structure Determination. Acta Cryst. 2015, A71, 3–8.10.1107/S2053273314026370Search in Google Scholar PubMed PubMed Central

3. Sheldrick, G. M. Crystal Structure Refinement with Shelxl. Acta Cryst. 2015, C71, 3–8; https://doi.org/10.1107/s2053229614024218.Search in Google Scholar

4. BRUKER. Saint, Apex2 and Sadabs; Bruker AXS Inc.: Madison, WI, USA, 2019.Search in Google Scholar

5. Ishii, Y.; Sakaguchi, S. A New Strategy for Alkane Oxidation with O2 Using N-Hydroxyphthalimide (NHPI) as a Radical Catalyst Catal. Surv. Jpn. 1999, 3, 27–35.Search in Google Scholar

6. Ishii, Y.; Sakaguchi, S.; Iwahama, T. PInnovation of Hydrocarbon Oxidation with Molecular Oxygen and Related Reactions. Adv. Synth. Catal. 2001, 343, 393–427; https://doi.org/10.1002/1615-4169(200107)343:5<393::aid-adsc393>3.0.co;2-k.10.1002/1615-4169(200107)343:5<393::AID-ADSC393>3.3.CO;2-BSearch in Google Scholar

7. Minisci, F.; Recupero, F.; Pedulli, G. F.; Lucarini, M. Transition Metal Salts Catalysis in the Aerobic Oxidation of Organic Compounds: Thermochemical and Kinetic Aspects and New Synthetic Developments in the Presence of N-Hydroxy-Derivative Catalysts. J. Mol. Catal. A 2003, 63, 63–90.10.1016/S1381-1169(03)00286-3Search in Google Scholar

8. Zhao, J.; Deng, C.; Zhang, L.; Zhang, J.; Rong, Q.; Wang, F.; Liu, Z. Q. NHPI-Catalyzed Electro-Oxidation of Alcohols to Aldehydes and Ketones. J. Org. Chem. 2024, 89, 15864–15876; https://doi.org/10.1021/acs.joc.4c02007.Search in Google Scholar

9. Sheldon, R. A.; Arends, I. W. C. E. Organocatalytic Oxidations Mediated by Nitroxyl Radicals. Adv. Synth. Catal. 2004, 346, 1051–1071; https://doi.org/10.1002/adsc.200404110.Search in Google Scholar

10. Karakurt, A.; Dalkara, S.; Ozalp, M.; Ozbey, S.; Kendi, E.; Stables, J. P. Synthesis of Some 1-(2-Naphthyl)-2-(imidazole-1-yl) ethanone oxime and Oxime Ether Derivatives and Their Anticonvulsant and Antimicrobial Activities. Eur. J. Med. Chem. 2001, 36, 421–433; https://doi.org/10.1016/s0223-5234(01)01223-5.Search in Google Scholar

11. Grochowski, E.; Boleslawska, T.; Jurczak, J. Reaction of Diethyl Azodicarboxylate with Ethers in the Presence of N-Hydroxyimides as Catalysts. Synthesis 1997, 1997, 718–720.10.1055/s-1977-24550Search in Google Scholar

12. Francesco, R.; Carlo, P. Free Radical Functionalization of Organic Compounds Catalyzed by N–Hydroxyphthalimide. Chem. Rev. 2007, 107, 3800–3842; https://doi.org/10.1021/cr040170k.Search in Google Scholar

13. Rani, R.; Granchi, C. Bioactive Heterocycles Containing Endocyclic N-Hydroxy Groups. Eur. J. Med. Chem. 2015, 97, 505–524; https://doi.org/10.1016/j.ejmech.2014.11.031.Search in Google Scholar PubMed PubMed Central

14. Masui, M.; Hara, S.; Ueshima, T.; Kawaguchi, T.; Ozaki, S. Anodic Oxidation of Compounds Having Benzylic or Allylic Carbon and α-Carbon to Hetero Atom Using N-Hydroxyphthalimide as a Mediator. Chem. Pharm. Bull. 1983, 31, 4209–4211; https://doi.org/10.1248/cpb.31.4209.Search in Google Scholar

15. Cai, Y.; Koshino, N.; Saha, B.; Espenson, J. H. Kinetics of Self-Decomposition and Hydrogen Atom Transfer Reactions of Substituted Phthalimide N-Oxyl Radicals in Acetic Acid. J. Org. Chem. 2005, 70, 238–243; https://doi.org/10.1021/jo048418t.Search in Google Scholar PubMed

16. Hui, Y.; Feng, X. Crystal Structure of 6-Hydroxy-5H-pyrrolo[3,4-b] pyrazine-5,7(6H)-dione, C6H3N3O3. Z. Kristallogr. - N. Cryst. Struct. 2025, 240, 647–648; https://doi.org/10.1515/ncrs-2025-0159.Search in Google Scholar

17. Centore, R.; Carella, A. N. N′-Dihydroxybenzene-1,2: 4,5-Tetracarboximide Dihydrate. Structure Reports 2013, 69, 1152–1153; https://doi.org/10.1107/s1600536813016991.Search in Google Scholar
Received: 2025-07-09
Accepted: 2025-09-02
Published Online: 2025-09-23
Published in Print: 2025-12-17

© 2025 the author(s), published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution 4.0 International License.

Articles in the same Issue

  1. Frontmatter
  2. New Crystal Structures
  3. The crystal structure of (1Z, 2Z)-3-phenyl-2-propenal 2-(4-bromo-2-fluorophenyl)hydrazone, C15H12BrFN2
  4. Refinement of crystal structure of 2-(2,3-dihydro-3-oxo-1 H -inden-1-ylidene)-1 H -indene-1,3(2 H )-dione C18H10O3
  5. The crystal structure of 3-(1-fluoro-2-(naphthalen-2-yl)-2-oxoethyl)-2-methoxy-3,4-dihydroisoquinolin-1(2H)-one, C22H18FNO3
  6. Crystal structure of the dinuclear copper(II) complex bis(μ2-2,2′ -{[1,3-phenylenebis-(methylene)]bis(oxy)}dibenzoaot-κ4O,O′:O′′,O′′′)-bis(dimethylformamide-κ1O)dicopper(II), C50H44Cu2N2O14
  7. Crystal structure of poly[triaqua-(μ9-biphenyl-3,3′,5,5′-tetracarboxylic-κ8 O,O:O,O′: O,O″:O,O‴)samarium(III)sodium(I)], C16H12NaSmO11
  8. The crystal structure of 5-benzyl-1-(4-fluorobenzyl)-4-((4-fluorobenzyl)oxy)-1,5-dihydro-2H-pyrrol-2-one, C25H21F2NO2
  9. The crystal structure of diammonium 2,5-dihydroxyterephthalate, C8H12N2O6
  10. Crystal structure of (E)-4-(4-(1H-1,2,4-triazol-1-yl)benzylidene)-6,8-dimethoxy-3,4-dihydrobenzo[b]oxepin-5(2H)-one, C21H19N3O4
  11. Crystal structure of poly[oktakis(μ2-oxido-κ2O:O)-tetrakis(oxido-κ1O)-bis(μ2-1,1′-[1,4-phenylenebis(methylene)]di(1H-imidazole-κ2N:N′))-tetravanadium(V)-dizinc(II)] monohydrate, C28H30Zn2N8O13V4
  12. Crystal structure of acotiamide hydrochloride dimethylacetamide solvate (1/1), C25H40ClN5O6S
  13. Crystal structure of catena-poly[monoaqua (u2-(3-(3,5-dicarboxyphenyl)pyridine-2,6-dicarboxylic-k4O:O′:O″:N)zinc(II))] monohydrate, C15H11NO10Zn
  14. Crystal structure of dichlorido{2,6-bis(3,5-diisopropyl-N-pyrazolyl)pyridine}zinc(II), C23H33Cl2N5Zn
  15. Crystal structure of nitrato-κ2O,O′-[hydridotris(3,5-diethylpyrazol-1-yl)borato-κ3N,N′,N″]copper(II), C21H34BCuN7O3
  16. Crystal structure of 2,7-bis(3,5-diethyl-1H-pyrazol-4-yl)-benzo[lmn][3,8]phenanthroline-1,3,6,8(2H,7H)-tetrone, C28H26N6O4
  17. Crystal structure of 2-(4-chlorophenyl)benzothiazole, C13H8ClNS
  18. Synthesis and crystal structure (3R,4′S)-4′-(3,5-dibromophenyl)-1′-methyl-2H-dispiro [benzofuran-3,3′-pyrrolidine-2′,2″-indene]-1″,2,3″-trione, C26H17Br2NO4
  19. Crystal structure of bis(((3a,7a-dihydro-1H-benzo[d][1,2,3]triazol-1-yl)methyl) triphenylphosphonium) tetrachloridomanganate(II), C50H42Cl4MnN6P2
  20. The crystal structure of 4,9-bis(4-chlorophenyl)-1,6-bis(2-cyanobenzyl)-2,4a,5,6,7,7a-hexahydro-1H-2,7,5-(epiprop[2]ene[1,1,3]triyl)pyrrolo[3,4-b]pyridine-3,10-dicarbonitrile, C40H26Cl2N6
  21. The crystal structure of poly((μ2-3-(3-nitro-4-carboxylphenyl)benzoate-κ3O, O′:O″)-μ2-1,4-bis(1-imidazolyl)benzene-κ2N:N′-cadmium(II)), C26H17N5O6Cd
  22. The crystal structure of 6-hydroxy-5H-pyrrolo[3,4-b]pyridine-5,7(6H)-dione monohydrate, C7H6N2O4
  23. Crystal structure of 4-((cyclohexylsulfonyl)methyl)-1,2,3,4-tetrahydrobenzo [4,5]imidazo[1,2-a]pyridine, C18H24N2O2S
  24. Crystal structure of 4,7-diphenyl-1,10-phenanthroline-κ2N,N′)-bis(2,4-di(fluorine)-1-phenylpyridine-κ2C,N)-iridium(III) hexafluorophosphate–dichloromethane (1/1), C47H30Cl2F10IrN4P
  25. Crystal structure of (4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl)boronic acid, C19H15BN2O2
  26. The crystal structure of (E)-(2-((pyridin-2-ylmethylene)amino)phenyl)arsonic acid, C12H11AsN2O3
  27. The crystal structure of N(benzyl(phenyl)carbomothioyl)benzamide, C21H18N2OS
  28. The crystal structure of bis(2-picolinium) hexachlorostannate dichloromethane monosolvate, C13H18Cl8N2Sn
  29. Crystal structure of poly[tetraaqua-bis(μ4-3–1-(carboxylatomethyl)-1H-1,2,4-triazole-3-carboxylato)-κ4O:O′,O″,N)zinc(II)], C5H7N3O6Zn
  30. The crystal structure of the co-crystal isonicotinamide – 2-(nitrophenyl)methanol (1/1), C6H6N2O·C7H7NO3
  31. The crystal structure of 4-(3-carboxy-1-ethyl-6-fluoro-4-oxo-1,4-dihydroquinolin-7-yl)piperazin-1-ium 2-fluorobenzoate hydrate, C23H25F2N3O6
  32. Crystal structure of [diaqua-{1H-benzo[d]imidazol-3-ium-5,6-dicarboxylato-κ2O,O′}magnesium(II)] C18H14MgN4O10
  33. Crystal structure of (3-(dimethoxymethyl)-5-methoxy-1H-indol-1-yl) (2-iodo-5-methoxyphenyl)methanone, C20H20INO5
  34. The crystal structure of 3,7,11-trimethylbenzo[5,6][1,4]thiazino[2,3,4-kl]phenothiazine 5,5,9,9-tetraoxide, C21H17NO4S2
  35. Crystal structure of tris(piperazine-1,4-diium)bis(2-hydroxy-1,2,3-propane-tricarboxylate) pentahydrate, C24H56N6O19
  36. Crystal structure of 2-chloro-5-((5-isopropyl-2-methylphenoxy)methyl)pyridine, C16H18ClNO
  37. Crystal structure of (E)-4-(4-(1H-pyrrol-1-yl)benzylidene)-6,8-dimethoxy-3,4-dihydrobenzo[(b)]oxepin-5(2H)-one, C23H21NO4
  38. Crystal structure of (E)-N′-(3,4-dichlorobenzylidene)-3,4,5-trimethoxybenzohydrazide, C17H16Cl2N2O4
  39. The crystal structure of 2-(2-hydroxyphenyl)-3-(pyridin-2-yl)-2,3- dihydroquinazolin-4(1H)-one, C19H15N3O2
  40. Crystal structure of 5-hydroxy-2-(4-hydroxyphenyl)-7-methoxy-8-methylchroman-4-one, C17H16O5
  41. Crystal structure of bis[(3,4-dimethoxybenzyl)triphenylphosphonium]di-μ2-bromido-dibromidodicopper(I)
  42. Crystal structure of bis [(1,3-dioxolan-2-ylmethyl)triphenylphosphonium] tetrabromidodicopper(I), C22H22Br2CuO2P
  43. Crystal structure of [1-(4-carboxyphenyl)-4-oxo-1,4-dihydropyridazine-3-carboxylic acid], C12H8N2O5
  44. The crystal structure of one-dimensional cooridnation polymer bis(thiocyanato)-bis((1E,2E)-1,2-bis(1-(pyridin-3-yl)ethylidene)-hydrazine κ2N:N)iron(II), (C30H28N10S2Fe)n
  45. Crystal structure of ((4-acetamidophenyl)sulfonyl)-l-alanine, C11H14N2O5S
  46. Crystal structure of [(1-naphthalen-1-yl-methyl)triphenylphosphonium] dichloridocopper(I), [C29H24P]+[CuCl2]−
  47. RbTm3S5: the first rubidium lanthanoid(III) sulfide with CsEr3Se5-type crystal structure
  48. Crystal structure of 2,2′-((ethane-1,2-diylbis(methylammoniumdiyl))bis(methylene))bis(pyridin-1-ium) diiodido-tris(μ2-iodido-κ2I:I)dicopper(II) chloride dihydrate, C16H30Cu2I6N4O2
  49. The crystal structure of 4-(trifluoromethyl)pyridine-2-carboxylic acid, C7H4F3NO2
  50. The crystal structure of (E)-2-ethoxy-1-methoxy-4-(2-(methylsulfonyl)vinyl)benzene, C12H16O4S
  51. Crystal structure of potassium 1H,1H,2H,2H-perfluorooctanesulfonate, C8H4O3F13SK
  52. Crystal structure of 4-(4-(quinolin-8-yloxy)-1,2,5-thiadiazol-3-yl)morpholine, C15H14O2N4S
  53. The crystal structure of 1,4-bis(bromomethyl)-2,5-dimethylbenzene, C10H12Br2
  54. The crystal structure of imidazo[4,5-e][1,3]diazepine-4,6,8-triamine methanol solvate, C7H11N7O
  55. The crystal structure of chlorido-bis(1,10-phenantroline-κ2N,N′)-(2-formylphenoxyacetato-κ2O,O) lead(II), C33H23N4O4ClPb
  56. Crystal structure of pyridinium tetrakis(1,1,1-trifluoro-2,4-pentadionato-κ2O,O′)yttrium(III) C20F12H16YO8C5H6N
https://doi.org/10.1515/ncrs-2025-0308
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Articles in the same Issue

  1. Frontmatter
  2. New Crystal Structures
  3. The crystal structure of (1Z, 2Z)-3-phenyl-2-propenal 2-(4-bromo-2-fluorophenyl)hydrazone, C15H12BrFN2
  4. Refinement of crystal structure of 2-(2,3-dihydro-3-oxo-1 H -inden-1-ylidene)-1 H -indene-1,3(2 H )-dione C18H10O3
  5. The crystal structure of 3-(1-fluoro-2-(naphthalen-2-yl)-2-oxoethyl)-2-methoxy-3,4-dihydroisoquinolin-1(2H)-one, C22H18FNO3
  6. Crystal structure of the dinuclear copper(II) complex bis(μ2-2,2′ -{[1,3-phenylenebis-(methylene)]bis(oxy)}dibenzoaot-κ4O,O′:O′′,O′′′)-bis(dimethylformamide-κ1O)dicopper(II), C50H44Cu2N2O14
  7. Crystal structure of poly[triaqua-(μ9-biphenyl-3,3′,5,5′-tetracarboxylic-κ8 O,O:O,O′: O,O″:O,O‴)samarium(III)sodium(I)], C16H12NaSmO11
  8. The crystal structure of 5-benzyl-1-(4-fluorobenzyl)-4-((4-fluorobenzyl)oxy)-1,5-dihydro-2H-pyrrol-2-one, C25H21F2NO2
  9. The crystal structure of diammonium 2,5-dihydroxyterephthalate, C8H12N2O6
  10. Crystal structure of (E)-4-(4-(1H-1,2,4-triazol-1-yl)benzylidene)-6,8-dimethoxy-3,4-dihydrobenzo[b]oxepin-5(2H)-one, C21H19N3O4
  11. Crystal structure of poly[oktakis(μ2-oxido-κ2O:O)-tetrakis(oxido-κ1O)-bis(μ2-1,1′-[1,4-phenylenebis(methylene)]di(1H-imidazole-κ2N:N′))-tetravanadium(V)-dizinc(II)] monohydrate, C28H30Zn2N8O13V4
  12. Crystal structure of acotiamide hydrochloride dimethylacetamide solvate (1/1), C25H40ClN5O6S
  13. Crystal structure of catena-poly[monoaqua (u2-(3-(3,5-dicarboxyphenyl)pyridine-2,6-dicarboxylic-k4O:O′:O″:N)zinc(II))] monohydrate, C15H11NO10Zn
  14. Crystal structure of dichlorido{2,6-bis(3,5-diisopropyl-N-pyrazolyl)pyridine}zinc(II), C23H33Cl2N5Zn
  15. Crystal structure of nitrato-κ2O,O′-[hydridotris(3,5-diethylpyrazol-1-yl)borato-κ3N,N′,N″]copper(II), C21H34BCuN7O3
  16. Crystal structure of 2,7-bis(3,5-diethyl-1H-pyrazol-4-yl)-benzo[lmn][3,8]phenanthroline-1,3,6,8(2H,7H)-tetrone, C28H26N6O4
  17. Crystal structure of 2-(4-chlorophenyl)benzothiazole, C13H8ClNS
  18. Synthesis and crystal structure (3R,4′S)-4′-(3,5-dibromophenyl)-1′-methyl-2H-dispiro [benzofuran-3,3′-pyrrolidine-2′,2″-indene]-1″,2,3″-trione, C26H17Br2NO4
  19. Crystal structure of bis(((3a,7a-dihydro-1H-benzo[d][1,2,3]triazol-1-yl)methyl) triphenylphosphonium) tetrachloridomanganate(II), C50H42Cl4MnN6P2
  20. The crystal structure of 4,9-bis(4-chlorophenyl)-1,6-bis(2-cyanobenzyl)-2,4a,5,6,7,7a-hexahydro-1H-2,7,5-(epiprop[2]ene[1,1,3]triyl)pyrrolo[3,4-b]pyridine-3,10-dicarbonitrile, C40H26Cl2N6
  21. The crystal structure of poly((μ2-3-(3-nitro-4-carboxylphenyl)benzoate-κ3O, O′:O″)-μ2-1,4-bis(1-imidazolyl)benzene-κ2N:N′-cadmium(II)), C26H17N5O6Cd
  22. The crystal structure of 6-hydroxy-5H-pyrrolo[3,4-b]pyridine-5,7(6H)-dione monohydrate, C7H6N2O4
  23. Crystal structure of 4-((cyclohexylsulfonyl)methyl)-1,2,3,4-tetrahydrobenzo [4,5]imidazo[1,2-a]pyridine, C18H24N2O2S
  24. Crystal structure of 4,7-diphenyl-1,10-phenanthroline-κ2N,N′)-bis(2,4-di(fluorine)-1-phenylpyridine-κ2C,N)-iridium(III) hexafluorophosphate–dichloromethane (1/1), C47H30Cl2F10IrN4P
  25. Crystal structure of (4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl)boronic acid, C19H15BN2O2
  26. The crystal structure of (E)-(2-((pyridin-2-ylmethylene)amino)phenyl)arsonic acid, C12H11AsN2O3
  27. The crystal structure of N(benzyl(phenyl)carbomothioyl)benzamide, C21H18N2OS
  28. The crystal structure of bis(2-picolinium) hexachlorostannate dichloromethane monosolvate, C13H18Cl8N2Sn
  29. Crystal structure of poly[tetraaqua-bis(μ4-3–1-(carboxylatomethyl)-1H-1,2,4-triazole-3-carboxylato)-κ4O:O′,O″,N)zinc(II)], C5H7N3O6Zn
  30. The crystal structure of the co-crystal isonicotinamide – 2-(nitrophenyl)methanol (1/1), C6H6N2O·C7H7NO3
  31. The crystal structure of 4-(3-carboxy-1-ethyl-6-fluoro-4-oxo-1,4-dihydroquinolin-7-yl)piperazin-1-ium 2-fluorobenzoate hydrate, C23H25F2N3O6
  32. Crystal structure of [diaqua-{1H-benzo[d]imidazol-3-ium-5,6-dicarboxylato-κ2O,O′}magnesium(II)] C18H14MgN4O10
  33. Crystal structure of (3-(dimethoxymethyl)-5-methoxy-1H-indol-1-yl) (2-iodo-5-methoxyphenyl)methanone, C20H20INO5
  34. The crystal structure of 3,7,11-trimethylbenzo[5,6][1,4]thiazino[2,3,4-kl]phenothiazine 5,5,9,9-tetraoxide, C21H17NO4S2
  35. Crystal structure of tris(piperazine-1,4-diium)bis(2-hydroxy-1,2,3-propane-tricarboxylate) pentahydrate, C24H56N6O19
  36. Crystal structure of 2-chloro-5-((5-isopropyl-2-methylphenoxy)methyl)pyridine, C16H18ClNO
  37. Crystal structure of (E)-4-(4-(1H-pyrrol-1-yl)benzylidene)-6,8-dimethoxy-3,4-dihydrobenzo[(b)]oxepin-5(2H)-one, C23H21NO4
  38. Crystal structure of (E)-N′-(3,4-dichlorobenzylidene)-3,4,5-trimethoxybenzohydrazide, C17H16Cl2N2O4
  39. The crystal structure of 2-(2-hydroxyphenyl)-3-(pyridin-2-yl)-2,3- dihydroquinazolin-4(1H)-one, C19H15N3O2
  40. Crystal structure of 5-hydroxy-2-(4-hydroxyphenyl)-7-methoxy-8-methylchroman-4-one, C17H16O5
  41. Crystal structure of bis[(3,4-dimethoxybenzyl)triphenylphosphonium]di-μ2-bromido-dibromidodicopper(I)
  42. Crystal structure of bis [(1,3-dioxolan-2-ylmethyl)triphenylphosphonium] tetrabromidodicopper(I), C22H22Br2CuO2P
  43. Crystal structure of [1-(4-carboxyphenyl)-4-oxo-1,4-dihydropyridazine-3-carboxylic acid], C12H8N2O5
  44. The crystal structure of one-dimensional cooridnation polymer bis(thiocyanato)-bis((1E,2E)-1,2-bis(1-(pyridin-3-yl)ethylidene)-hydrazine κ2N:N)iron(II), (C30H28N10S2Fe)n
  45. Crystal structure of ((4-acetamidophenyl)sulfonyl)-l-alanine, C11H14N2O5S
  46. Crystal structure of [(1-naphthalen-1-yl-methyl)triphenylphosphonium] dichloridocopper(I), [C29H24P]+[CuCl2]−
  47. RbTm3S5: the first rubidium lanthanoid(III) sulfide with CsEr3Se5-type crystal structure
  48. Crystal structure of 2,2′-((ethane-1,2-diylbis(methylammoniumdiyl))bis(methylene))bis(pyridin-1-ium) diiodido-tris(μ2-iodido-κ2I:I)dicopper(II) chloride dihydrate, C16H30Cu2I6N4O2
  49. The crystal structure of 4-(trifluoromethyl)pyridine-2-carboxylic acid, C7H4F3NO2
  50. The crystal structure of (E)-2-ethoxy-1-methoxy-4-(2-(methylsulfonyl)vinyl)benzene, C12H16O4S
  51. Crystal structure of potassium 1H,1H,2H,2H-perfluorooctanesulfonate, C8H4O3F13SK
  52. Crystal structure of 4-(4-(quinolin-8-yloxy)-1,2,5-thiadiazol-3-yl)morpholine, C15H14O2N4S
  53. The crystal structure of 1,4-bis(bromomethyl)-2,5-dimethylbenzene, C10H12Br2
  54. The crystal structure of imidazo[4,5-e][1,3]diazepine-4,6,8-triamine methanol solvate, C7H11N7O
  55. The crystal structure of chlorido-bis(1,10-phenantroline-κ2N,N′)-(2-formylphenoxyacetato-κ2O,O) lead(II), C33H23N4O4ClPb
  56. Crystal structure of pyridinium tetrakis(1,1,1-trifluoro-2,4-pentadionato-κ2O,O′)yttrium(III) C20F12H16YO8C5H6N
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