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Crystal structure of ethyl 3-(trifluoromethyl)-1H-pyrazole-4-carboxylate, C7H7F3N2O2

  • Željko. K. Jaćimović ORCID logo EMAIL logo , Sladjana B. Novaković , Goran A. Bogdanović , Milica Kosović , Eugen Libowitzky and Gerald Giester
Published/Copyright: June 20, 2020
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Zeitschrift für Kristallographie - New Crystal Structures
From the journal Zeitschrift für Kristallographie - New Crystal Structures Volume 235 Issue 5

Abstract

C7H7F3N2O2, monoclinic, P21/m (no. 11), a = 6.8088(8) Å, b = 6.7699(9) Å, c = 9.9351(12) Å, β = 105.416(3)°, V = 441.48(9) Å3, Z = 2, Rgt(F) = 0.0398, wRref(F2) = 0.1192, T = 200(2) K.

CCDC no.: 2007110

The molecular structure is shown in the figure. Table 1 contains crystallographic data and Table 2 contains the list of the atoms including atomic coordinates and displacement parameters.

Table 1:

Data collection and handling.

Crystal:Colorless prism
Size:0.32 × 0.19 × 0.08 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:0.16 mm−1
Diffractometer, scan mode:Bruker Apex-II, φ and ω
θmax, completeness:33.2°, >99%
N(hkl)measured, N(hkl)unique, Rint:17052, 1819, 0.025
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 1466
N(param)refined:86
Programs:Bruker [1], SHELX [2], [3], Platon [4], Mercury [5]
Table 2:

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2).

AtomxyzUiso*/Ueq
F10.43896(17)0.25000.08691(10)0.0588(4)
F20.67754(12)0.40673(15)0.23115(9)0.0573(3)
O10.85926(15)0.25000.52269(12)0.0416(3)
O20.70241(15)0.25000.69374(10)0.0336(2)
N10.16706(17)0.25000.39173(13)0.0314(3)
N20.23079(17)0.25000.27439(13)0.0319(3)
C30.43220(19)0.25000.32107(13)0.0263(2)
C40.49813(18)0.25000.46784(13)0.0235(2)
C50.31902(19)0.25000.50850(14)0.0272(3)
H50.30660.25000.60150.033*
C60.70491(19)0.25000.56073(14)0.0265(3)
C70.8989(2)0.25000.79805(16)0.0369(3)
H7A0.97830.36880.78750.044*
C80.8546(3)0.25000.93749(18)0.0520(5)
H8A0.98290.25001.01120.078*
H8B0.77580.13180.94630.078*
C90.5551(2)0.25000.21712(15)0.0363(3)
H1N0.041(3)0.25000.387(2)0.042(5)*

Source of material

The 4 cm3 of warm ethanolic solution of ethyl 3-(trifluoromethyl)-1H-pyrazole-4-carboxylate (Sigma-Aldrich) and 3 cm3 of warm ethanolic solution of Zn(OAc)2 ⋅ 2H2O was mixed in ratio 1:2. The resulting unicolor solution was allowed to concentrate at ambient conditions for 3 days and the investigated sample material was filtered off and washed with ethanol. Colorless crystals of ethyl 3-(trifluoromethyl)-1H-pyrazole-4-carboxylate were obtained.

Experimental details

H atoms bonded to C atoms were placed at geometrically idealized positions and refined as riding atoms [C—H = 0.95–0.99 Å and Uiso(H) = 1.2Ueq(C) or 1.5Ueq(C)]. H atom attached to N atom was located in difference Fourier maps and refined isotropically.

Comment

Pyrazole derived compounds possess a wide range of biological activities including antimicrobial, antiviral, anti-inflammatory, anticancer, analgesic, antipyretic [6], [7], [8]; accordingly, the pyrazole fragment represents an important component of a number of therapeutic drugs [8 and references therein]. The presence of fluoroalkyl substituents on the pyrazole ring, as is the case with the pyrazole based drug Celebrex, can improve the lipophilicity and solubility of a molecule and thus influence its biological activity [9]. Also, the incorporation of carboxylic acid groups and carboxylic ester functionality facilitates further modification and improvement of bioactivity of the pyrazole based molecules [10]. As a part of our continuous research interest in the pyrazole derived compounds [11], [12], [13] we report here the crystal structure of ethyl 3-(trifluoromethyl)-1H-pyrazole-4-carboxylate.

In the title pyrazole derivative the pyrazole ring attaches the fluoroalkyl and carboxylic ester substituents. The molecule lies on a crystallographic mirror plane thus the constituent atoms are coplanar, with the exception of F and H atoms attached to sp3 carbon atoms (see the figure). Bond lengths and angles are in the expected ranges [13], [14], [15]. In the crystal the molecules interact by N1—H1⋯O1ii hydrogen bonds [H⋯O 2.06(3) Å; N—H⋯O 137(2)°; symmetry code: (ii) x − 1, y, z] to form a chain along the crystallographic a axis. The pyrazole hydrogen bonding acceptor N2 involves only in a long contact with the terminal ester carbon, C8—H8a⋯N2ii [H⋯N 2.71 Å; C—H⋯O 158°; symmetry code: (iii) x + 1, +y, +z + 1]. The planar molecules form the layered structure parallel to (010) plane. The mutual distance between the neighboring layers is 3.385 Å [symmetry code (i) = x, −y + 1/2, z].

Acknowledgements

M. K. and Ž.K.J. thank to the Ministry of Science of the Republic of Montenegro for financial support (Innovative Project-Bioextra); G.A.B and S.B.N thank to the Ministry of Education, Science and Technological Development of the Republic of Serbia for financial support.

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Received: 2020-05-19
Accepted: 2020-06-02
Published Online: 2020-06-20
Published in Print: 2020-08-26

©2020 Željko. K. Jaćimović et al., published by De Gruyter, Berlin/Boston

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

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  68. Crystal structure of catena-poly[diaqua-(μ2-tartrato-κ4O,O′:O′′,O′′′)zinc(II)], C4H8O8Zn
  69. The crystal structure of (6aR,6bS,8aS,8bR,9S,11aS,12aS,12bS)-10-(4-acetoxy-3-methylbutyl)-6a,8a,9-trimethyl-3,4,5,6,6a,6b,7,8,8a,8b,9,10,11a,12,12a,12b-hexadecahydro-1H-naphtho[2′,1′:4,5]indeno[2,1-b]furan-4-yl acetate, C31H48O5
  70. Crystal structure of 4,4′-(oxybis(methylene))bis(bromobenzene), C14H12Br2O
  71. Crystal structure of (N,N-dimethylsulphoxide)-[N-(3-ethoxy-2-(oxide)benzylidene)-3-methoxybenzenecarbohydrazonato-κ3N,O,O′]-dioxo-molybdenum(VI), C19H22MoN2O7S
  72. Crystal structure of dichlorido-bis(dimethyl sulphoxide-κO)-bis(4-methylbenzyl-κC1)tin(IV), C20H30Cl2O2S2Sn
  73. Crystal structure of (E)-2-amino-N′-(2-hydroxy-4-(2-(piperidin-1-yl)ethoxy)benzylidene)benzohydrazide monohydrate, C21H26N4O3 ⋅ H2O
  74. Crystal structure of chloridotris(4-chlorophenyl)(dimethyl sulfoxide-κO)tin(IV), C20H18Cl4OSSn
  75. Crystal structure of catena{di-aqua-sodium-[N-(hydroxyethyl), N-isopropyl-dithiocarbamato]}n, [C6H16NNaO2S2]n
  76. Crystal structure of 2,2,4,4,6,6-hexakis(4-chlorophenyl)-1,3,5,2,4,6-trithiatristanninane, C36H24Cl6S3Sn3
  77. Crystal structure of 6-methoxy-3-(5-(3-methoxyphenyl)-1,3,4-oxadiazol-2-yl)-4H-chromen-4-one-methanol (1/1), C20H18N2O6
  78. Crystal structure of hexanedihydrazide, C6H14N4O2
  79. Crystal structure of tert-butyl 2-(hydroxymethyl)-5-{4-[(methoxycarbonyl)amino]phenyl}-2,5-dihydro-1H-pyrrole-1-carboxylate, C18H24N2O5
  80. Crystal structure of [(Z)-O-isopropyl N-(4-nitrophenyl)thiocarbamato-κS]-(triphenylphosphine-κP)-gold(I), C28H26AuN2O3PS
  81. Crystal structure of [O-ethyl N-(4-nitrophenyl)thiocarbamato-κS](tri-4-tolylphosphine-κP)gold(I) tetrahydrofuran solvate, C30H30AuN2O3PS, C4H8O
https://doi.org/10.1515/ncrs-2020-0242
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Articles in the same Issue

  1. Frontmatter
  2. Crystal structure of isopimara-7,15-dien-3-one, C20H30O
  3. Crystal structure of bis(6-aminopyridine-2-carboxylato-κ2O,N)-copper(II), C12H10O6N4Cu
  4. Crystal structure of 5,6-diphenyldibenzo[c, g]chrysene, C38H24
  5. Poly[bis(dimethylformamide-κO)-(μ8-5,5′′-dicarboxy-[1,1′:4′,1′′-terphenyl]-2′,3,3′′,5′-tetracarboxylato-κ8O:O1:O2:O3:O4:O5:O6:O7)dizinc(II)] — dimethylformamide (1/2), C18H19N2O8Zn
  6. The crystal structure of poly[bis(N,N-dimethylformamide-κ1O)(μ4- 2′,5,5′,5′′-tetracarboxy-[1,1′:4′,1′′-terphenyl]-3,3′′-dicarboxylato-κ4O:O′:O′′:O′′′)manganese(II)] — N,N-dimethylformamide (1/2), C36H40N4O16Mn
  7. Crystal structure of N,N-dimethyl-4-((7-nitrobenzo[c][1,2,5]thiadiazol-4-yl)ethynyl)aniline, C16H12N4O2S
  8. The crystal structure of 8a-methoxy 8a-methoxy-1,5,8a,9a-tetrahydro-4H-8,9-dioxa-3a1λ4-aza-8aλ4, C18H14BNO3
  9. Crystal structure of poly[diaqua-(μ2-5-isopropoxyisophthalato-κ2O:O′)-(μ2-(1,3-bis(3,5-di(1H-imidazol-1-yl)pyridine))-κ2N:N′)cobalt(II)] monohydrate, C22H25N5O8Co
  10. The crystal structure of acetoximium 1′-hydroxy-1H,1H′-5,5′-bitetrazole-1-olate monohydrate, C5H11N9O4
  11. Crystal structure of 3-(2-ethoxy-2-oxoethyl)-1-vinyl-1H-imidazol-3-ium hexafluoridophosphate(V), C9H13F6N2O2P
  12. The crystal structure of catena-poly[(μ2-4-(benzo[d]imidazol-2-yl)benzenecarboxylato-κ2N,O)-(μ2-4-(benzo[d]imidazol-2-yl)benzenecarboxylato-κ3N,O:O′)cadmium(II)]dihydrate, C28H22CdN4O6
  13. Enzyme-mediated synthesis and crystal structure of (2R,4S)-hydroxyketamine, C13H16ClNO2
  14. The crystal structure of bis(isothiocyanato-κ1N)-(methanol-κ1O)-[2-morpholine-4-yl-4,6-di(pyrazol-1-yl)-1,3,5-triazine-κ3N,N′,N′′] manganese(II), C16H18MnN10O2S2
  15. Crystal structure of bis{5-chloro-2-(((4-trifluoromethyl)imino)methyl)phenolato-κ2N,O}copper(II), C28H16Cl2CuF6N2O2
  16. Crystal structure of bis(1,3-phenylenedimethanaminium) bis(triiodide) tetraiodide – water (1/2) , C8H16I5N2O
  17. Crystal structure and anti-inflammatory activity of (3E,5E)-3,5-bis(2-fluorobenzylidene)-1-((4-fluorophenyl)sulfonyl)piperidin-4-one, C25H18F3NO3S
  18. The crystal structure of bis{3-(diphenylphosphaneyl)propanoato-κ2O,P}platinum(II) dihydrate, C30H28O6P2Pt
  19. The crystal structure of (E)-2-(4-((4-fluorobenzyl)oxy)styryl)-4,6-dimethoxybenzaldehyde, C24H21FO4
  20. Crystal structure of bis[3-methoxy-N-(1-(pyrazin-2-yl)ethylidene)benzohydrazonato-κ3O,N,N′]nickel(II), C28H26N8O4Ni
  21. Crystal structure of 1-(2-(pyridin-2-yl)-5-(pyridin-3-yl)-1,3,4-oxadiazol-3(2H)-yl)ethan-1-one, C14H12N4O2
  22. Synthesis and crystal structure of 3-N-acetyl-5-(pyridin-3-yl)-2-(quinolin-2-yl)-1,3,4-oxadiazoline, C18H14N4O2
  23. Crystal structure of 2-methyl-1H-perimidine, C12H10N2
  24. Crystal structure of (E)-2-(5,5-dimethyl-3-(4-((7-nitrobenzo[c][1,2,5]oxadiazol-4-yl)oxy)styryl)cyclohex-2-en-1-ylidene)malononitrile, C25H19N5O4
  25. Structural elucidation of 1-(3-acetyl-2,6-dihydroxy-4-methoxyphenyl)-4,5-dihydroxy-2-methylanthracene-9,10-dione isolated from Bulbine latifolia (L.) Wild, C24H18O8
  26. Crystal structure of 3-cinnamoyl-4-hydroxybenzoic acid, C16H12O4
  27. The crystal structure of poly[bis(μ4-2,3-pyridinedicarboxylato)-(μ2-oxalyl dihydrazide)-dicadmium(II) dihydrate], C16H16O12N6Cd2
  28. Synthesis and crystal structure of 1-{4-[(3-bromo-2-hydroxy-benzylidene)amino]phenyl}ethanone, C15H12BrNO2
  29. Synthesis and crystal structure of 1-{4-[(2-bromo-6-hydroxy-benzylidene)amino]phenyl}ethanone, C15H12BrNO2
  30. Crystal structure of (4-aminobenzoato-κ2O,O′)-[5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane-κ4N,N′,N′′,N′′′]nickel(II) perchlorate monohydrate, C23H44ClN5NiO7
  31. Crystal structure of 1-{4-[(4-fluoro-2-hydroxy-benzylidene)amino]phenyl}ethanone, C15H12FNO2
  32. Preparation and crystal structure of a non-symmetrical vanadium(II) dimer: tri-μ2-bromido-(hydrogen-tris(3-isopropyl-4-bromopyrazol-1-yl)borato-κ3N,N′,N′′)-tris(tetrahydrofuran-κO)divanadium(II) – tetrahydrofuran (1/1), C34H57BBr6N6O4V2
  33. Crystal structure of bis{2-(((4-(1-(hydroxyl-imino)ethyl)phenyl)imino)methyl)phenolato-κ2N,O}cobalt(II), C30H26CoN4O4
  34. Crystal structure of 3-((3-nitrophenyl)sulfonamido)propanoic acid — 4,4′-bipyridine (1/1), C19H18N4O6S
  35. Crystal structure of cyclo[diaqua-bis(μ2-3′,5-dicarboxy-[1,1′-biphenyl]-3,4′-dicarboxylato-κ4O,O′:O′′,O′′′)-bis(4,4′-bis(pyrid-4-yl)biphenyl-K1N)dicadmium(II)], C76H52Cd2N4O18
  36. Crystal structure of 1-(adamantan-1-yl)-3-aminothiourea, C11H19N3S
  37. Crystal structure of catena-poly[triaqua-(μ2-1,4-di(pyridin-4-yl)benzene-κ2N:N′)-(3′,5-dicarboxy-[1,1′-biphenyl]-3,4′-dicarboxylato-κO)nickel(II)], C32H26N2O11Ni
  38. Crystal structure of catena-poly[aqua-(μ4-4,4′-(pyridine-3,5-diyl)dibenzoato-κ4O,O′:O′′:O′′′)zinc(II)], C19H13NO5Zn
  39. Crystal structure of 4-(4′-(pyridin-4-yl)-[1,1′-biphenyl]-4-yl)pyridin-1-ium 2-carboxy-4-(3,5-dicarboxyphenoxy)benzoate hydrate, C38H28N2O10
  40. Crystal structure of 3-[(triisopropylsilanyl)-ethynyl]-6a,12a-dihydro-1H-1,4-diaza-benzo[α]anthracene-2,7,12-trione, C27H28N2O3Si
  41. Crystal structure of [(bis(1,10-phenanthroline-κ2N,N′)-(2-carboxy-4-(3-carboxy-5-carboxylatophenoxy)benzoato-κ2O:O′))nickel(II) monohydrate, (1,10-phenanthroline-κ2N:N′)-(μ2-(5-(3′,4′-dicarboxylphenoxy)-isophthalate-κ2O:O′))nickel(II)], C40H24N4O9Ni ⋅ H2O
  42. Crystal structure of 4-(3-(pyridin-3-yl)ureido)benzoic acid — adipic acid (2/1), C16H16N3O5
  43. Crystal structure of poly[bis{μ2-5-carboxy-4′-methyl-[1,1′-biphenyl]-3-carboxylato-κ2O:O′}-{μ2-4,4′-bipyridine-κ2N:N′}]cobalt(II), C40H30N2O8Co
  44. Crystal structure of aqua-(2,2′-bipyridine-κ2N,N′)(((3-nitrophenyl)sulfonyl)glycine-κ2N,O)copper(II) dihydrate, C18H20CuN4O9S
  45. Crystal structure of bis{2-bromo-6-(((4-(1-(methoxyimino)ethyl)phenyl)imino)methyl)phenolato-κ2N,O}copper(II), C32H28Br2CuN4O4
  46. Crystal structure of bis(2-(2-((2,6-dichlorophenyl)amino)phenyl)acetato-κ2O,O′)-(1,10-phenanthroline-κ2N,N′)zinc(II), C40H28Cl4N4O4Zn
  47. Crystal structure of 2-(3,6-dimethyl-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)-2-oxoethyl acetate, C14H17NO4
  48. Crystal structure of poly[dibromido-bis(μ2-1,6-di(1H-imidazol-1-yl)hexane-κ2N:N′)cadmium(II)], C24H36Br2N8Cd
  49. Synthesis and crystal structure of ((6R,7S)-3-ethyl-6-phenyl-6,7-dihydro-5H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazin-7-yl)(phenyl)methanone hemihydrate, 2(C19H18N4OS) ⋅ H2O
  50. Crystal structure of 2-(5-(pyridin-3-yl)-4-(pyridin-4-yl)-4H-1,2,4-triazol-3-yl)pyridine, C17H12N6
  51. The crystal structure of N-((1E,2E)-1,3-bis(4-fluorophenyl)but-2-en-1-ylidene)-4-methylbenzenesulfonamide, C23H19F2NO2S
  52. Crystal structure of diacetato-κ1O-diethanol-κ1O-bis(μ2-2-(((2-hydroxyethyl)imino)methyl)-5-methoxyphenolato-κ4O,N,O′:O′′)dinickel(II), C28H42Ni2N2O12
  53. The crystal structure of catena-poly[chlorido-(μ2-1,4-bis(pyridin-3-yl-methoxy)benzene-κ2N:N′)copper(II)], C18H16ClN2O2Cu
  54. N′,N′′′-(((ethane-1,2-diylbis(oxy))bis(2,1-phenylene))bis(methaneylylidene))bis(2-hydroxybenzohydrazide)nickel(II), C30H24N4NiO6
  55. Crystal structure of (E)-3′,6′-bis(ethylamino)-2′,7′-dimethyl-2-(2-((quinolin-2-ylmethylene)amino)ethyl)spiro[isoindoline-1,9′-xanthen]-3-one, C38H37N5O2
  56. Crystal structure of 4,4′-di(1H-imidazol-1-yl)-1,1′-biphenyl-1-ium 5,3′,5′-tricarboxy-[1,10-biphenyl]-2-carboxylate, C25H17N2O8
  57. The crystal structure of 1-carboxy-2-(1H-indol-3-yl)-N,N,N-trimethylethan-1-ammonium chloride, C14H19N2O2Cl
  58. The crystal structure of 5-bromo-2-fluoronicotinic acid monohydrate, C6H5BrFNO3
  59. Crystal structure of ethyl 3-(trifluoromethyl)-1H-pyrazole-4-carboxylate, C7H7F3N2O2
  60. Crystal structure of tetrakis(1H-benzo[d]imidazol-3-ium) bis(μ5-phenylphosphonato)-pentakis(μ2-oxido)-decaoxo-penta-molybdenum dihydrate, C40H42Mo5N8O23P2
  61. Structure of 7-(3,3,4,4,5,5-hexafluoro-2-(2-methylbenzo[b]thiophen-3-yl)cyclopent-1-en-1-yl)-8-methylquinoline, C24H15F6NS
  62. Crystal structure of monocarbonyl[2-((cyclopentylmethylene)amino)-5-methylphenolato-κ2N,O] (tricyclohexylphosphine)rhodium(I), C32H48NO2PRh
  63. The crystal structure of fac-tricarbonyl(1,10-phenanthroline-κ2N,N′)-(pyrazole-κN)rhenium(I)nitrate, C18H12O3N4Re
  64. Crystal structure of poly[diaqua-bis(μ2-4-(3-(pyridin-3-yl)-1H-1,2,4-triazol-5-yl)benzoato-κ2N:O)nickel(II)], C28H22O6N8Ni
  65. Crystal structure of 4,4′-bis(pyridin-1-ium-4-yl)biphenyl poly[bis(μ2-4,4′-bis(pyrid-4-yl)biphenyl-K2N:N′)-tetrakis(μ4-4′-methyl-[1,1′-biphenyl]-3,5-dicarboxylato-K4O,O′:O′′:O′′′)-bis[[μ2-1,1′-biphenyl]-3-carboxyl-5-carboxylato-K2O:O′]tetracobalt(II)]— [1,1′-biphenyl]-3,5-dicarboxylic acid (1/2), C93H68N3O16Co2
  66. The crystal structure of 4a-formyl-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b,13,14b-icosahydro-1-2-6a,6b,9,9,12a-heptamethylpicen-10-yl acetate, C32H50O3
  67. Crystal structure of 3,3′-(1,2-phenylenebis(methylene))bis(1-methyl-1H-imidazol-3-ium) bis(hexafluoridophosphate), C16H20F12N4P2
  68. Crystal structure of catena-poly[diaqua-(μ2-tartrato-κ4O,O′:O′′,O′′′)zinc(II)], C4H8O8Zn
  69. The crystal structure of (6aR,6bS,8aS,8bR,9S,11aS,12aS,12bS)-10-(4-acetoxy-3-methylbutyl)-6a,8a,9-trimethyl-3,4,5,6,6a,6b,7,8,8a,8b,9,10,11a,12,12a,12b-hexadecahydro-1H-naphtho[2′,1′:4,5]indeno[2,1-b]furan-4-yl acetate, C31H48O5
  70. Crystal structure of 4,4′-(oxybis(methylene))bis(bromobenzene), C14H12Br2O
  71. Crystal structure of (N,N-dimethylsulphoxide)-[N-(3-ethoxy-2-(oxide)benzylidene)-3-methoxybenzenecarbohydrazonato-κ3N,O,O′]-dioxo-molybdenum(VI), C19H22MoN2O7S
  72. Crystal structure of dichlorido-bis(dimethyl sulphoxide-κO)-bis(4-methylbenzyl-κC1)tin(IV), C20H30Cl2O2S2Sn
  73. Crystal structure of (E)-2-amino-N′-(2-hydroxy-4-(2-(piperidin-1-yl)ethoxy)benzylidene)benzohydrazide monohydrate, C21H26N4O3 ⋅ H2O
  74. Crystal structure of chloridotris(4-chlorophenyl)(dimethyl sulfoxide-κO)tin(IV), C20H18Cl4OSSn
  75. Crystal structure of catena{di-aqua-sodium-[N-(hydroxyethyl), N-isopropyl-dithiocarbamato]}n, [C6H16NNaO2S2]n
  76. Crystal structure of 2,2,4,4,6,6-hexakis(4-chlorophenyl)-1,3,5,2,4,6-trithiatristanninane, C36H24Cl6S3Sn3
  77. Crystal structure of 6-methoxy-3-(5-(3-methoxyphenyl)-1,3,4-oxadiazol-2-yl)-4H-chromen-4-one-methanol (1/1), C20H18N2O6
  78. Crystal structure of hexanedihydrazide, C6H14N4O2
  79. Crystal structure of tert-butyl 2-(hydroxymethyl)-5-{4-[(methoxycarbonyl)amino]phenyl}-2,5-dihydro-1H-pyrrole-1-carboxylate, C18H24N2O5
  80. Crystal structure of [(Z)-O-isopropyl N-(4-nitrophenyl)thiocarbamato-κS]-(triphenylphosphine-κP)-gold(I), C28H26AuN2O3PS
  81. Crystal structure of [O-ethyl N-(4-nitrophenyl)thiocarbamato-κS](tri-4-tolylphosphine-κP)gold(I) tetrahydrofuran solvate, C30H30AuN2O3PS, C4H8O
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