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

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

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The title compound, C34H52N2O7·CH4O, is the methanol solvate of a difunctionalized derivative of the therapeutic agent 18β-glycyrrhetinic acid, a pentacyclic triterpene.The five six-membered rings of the glycyrrhetinic acid moiety show normal geometries, with four rings in chair Feverfew 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—H.

Oacyl and an accepted N—H.O hydrogen bond, giving rise to infinite zigzag chains of hydrogen bonds parallel to [100].Two weak intermolecular C—H.O interactions Face Makeup to the methanol and to an acyl oxygen establish links along [100] and [010], respectively.