Acta Cryst. (2012). E68, o1229-o1230  [ doi:10.1107/S1600536812012561 ]

(3,18,20)-N-Ethoxycarbonylmethyl-3-nitrato-11-oxoolean-12-ene-29-carboxamide methanol monosolvate

L. Czollner, U. Jordis and K. Mereiter

Abstract: The title compound, C₃₄H₅₂N₂O₇·CH₄O, is the methanol solvate of a difunctionalized derivative of the therapeutic agent 18-glycyrrhetinic acid, a pentacyclic triterpene. The five six-membered rings of the glycyrrhetinic acid moiety show normal geometries, with four rings in chair conformations and the unsaturated ring in a half-chair conformation. This moiety is substituted by a nitrate ester group and an O-ethylglycine group. In the crystal, the nonsolvent molecules are packed parallel to (010) in a herringbone fashion with the nitrato, ethylglycine and methanol-O atom being proximate. The methanol solvent molecule is anchored via a donated O-HO_acyl and an accepted N-HO hydrogen bond, giving rise to infinite zigzag chains of hydrogen bonds parallel to [100]. Two weak intermolecular C-HO interactions to the methanol and to an acyl oxygen establish links along [100] and [010], respectively.

Online 31 March 2012

Copyright © International Union of Crystallography
IUCr Webmaster