Acta Cryst. (2006). E62, o1428-o1430  [ doi:10.1107/S1600536806008944 ]

14-Acetyl-20-ethyl-1,8-dihydroxy-16,18-dimethoxylycoctonine

M. Ahmad, S. Ali, F. Shaheen, S. Anjum and M. I. Choudhary

Abstract: The title compound (C₂₅H₃₉NO₆), a polycyclic diterpenoid alkaloid, has been isolated from Delphinium roylei Munz. Two cis-fused ring junctions are observed between cyclohexane A and piperidine E rings and between cyclohexane B and cyclopentane C rings. Two trans-fused ring junctions involve cyclohexane A and cyclopentane B rings and also piperidine E and cyclopentane F rings. Cyclopentane ring F is in a twist conformation, while the other cyclopentane ring, C, forms an envelope conformation. Piperidine ring E is in a chair conformation, the two cyclohexane rings A and B adopt twist-boat conformations and cyclohexane ring D is in a screw-boat conformation. Of the five substituents, only one is -oriented. The molecules are packed along the c axis in layers parallel to the ab plane and stabilized by weak inter- and intramolecular O-HO and O-HN hydrogen bonds.

Online 15 March 2006

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