Home The crystal structure of actarit, C10H11NO3
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The crystal structure of actarit, C10H11NO3

  • Fengfeng Wang ORCID logo , Xu Lu , Qiqi Mao , Xiaowen Hu ORCID logo and Yang Liu ORCID logo EMAIL logo
Published/Copyright: April 15, 2025

Abstract

C10H11NO3, orthorhombic, Pbca (no. 61), a = 13.3367(3) Å, b = 7.8091(2) Å, c = 18.7826(3) Å, V = 1956.16(7) Å3, Z = 4, Rgt(F) = 0.0393, wRref(F2) = 0.1131, T = 297 K.

CCDC No.: 2425563

The molecular structure is shown in the figure. Table 1 contains crystallographic data. 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 plate
Size: 0.25 × 0.25 × 0.10 mm
Wavelength: Cu Kα radiation (1.54184 Å)
μ: 0.81 mm−1
Diffractometer, scan mode: Rigaku Synergy, ω scans
θmax, completeness: 75.8°, 100 %
N(hkl)measured, N(hkl)unique, Rint: 9658, 1963, 0.033
Criterion for Iobs, N(hkl)gt: Iobs > 2 σ(Iobs), 1,734
N(param)refined: 135
Programs: Rigaku, 1 Olex2, 2 SHELX 3 , 4

1 Source of materials

The title compound (actarit, systematic name: methyl 5′-(hydroxymethyl)-7,7′-dimethoxy-[4,4′-bibenzo[d][1,3]dioxole]-5-carboxylate) was bought from Shanghai Bide Pharmatech Co., Ltd. About 20 mg actarit powder was placed into a 10 ml penicillin bottle, followed by addition of 3 ml methanol. The mixture was shaken intermittently to ensure complete dissolution. The penicillin bottle was left open and placed in a fume hood. After 2 days, plate-shaped crystals precipitated. System name: 4-acetylaminophenylacetic acid.

2 Experimental details

The positions of hydrogen atoms on carbon atoms were calculated geometrically and refined using the riding model. Their coordinates and displacement parameters were constrained to ride on the carrier atom.

The hydrogen atom on oxygen atom and nitrogen atom were located from difference Fourier map inspection and refined with Uiso(H) = 1.5Ueq(O) or Uiso(H) = 1.5Ueq(N). The distance between the hydrogen atom and the oxygen atom or the nitrogen atom were refined freely. A DFIX restrain was used to get a better model for the hydrogen atom.

3 Comment

Actarit is an immunomodulatory agent primarily used in the treatment of rheumatoid arthritis (RA). 5 It functions by modulating the immune system to reduce inflammation and joint damage. 6 The exact mechanism of action of actarit is not fully understood, but research suggests that it may work by inhibiting the production of certain inflammatory mediators or by modulating T-cell function. 7 , 8

The titled compound was crystallized in Pbca space group with one molecule in its asymmetric unit. The bond lengths and angles within this simple molecule are in the expected ranges. The bond length between O1 and C8 is 1.1954(17) Å, and the bond length between O2 and C8 is 1.2997(16) Å, indicating that the terminal group is an un-ionized carboxyl group. The torsion angle of C1–N1–C9–O3 is −4.2(2)°, suggesting that the amide group and the benzene ring are not completely coplanar. This structure extends into a complex three-dimensional network through hydrogen bonding.


Corresponding author: Yang Liu, Institute for Chemical Drug Control, National Institutes for Food and Drug Control, Beijing, 102629, P. R. China, E-mail:

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: Institute Building Project of NIFDC (No. 2024HYZX39).

  3. Conflict of interest: The authors declare no conflicts of interest regarding this article.

References

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Received: 2025-02-25
Accepted: 2025-04-01
Published Online: 2025-04-15
Published in Print: 2025-06-26

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

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

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