3α-[(5S,6S,7R)-5-Ethyl-1,2,3,4,5,6,7,8,9,10-decahydro-6-hydroxy-3,7-methanoazacycloundecino[5,4-b]indol-12-yl]vobasan-17-oic acid methyl ester

This dimeric alkaloid also occurs in the leaves and stem bark of Capuronetta elegans and forms colourless crystals from MeOH. It is laevorotatory having a specific rotation of [α]_D²⁰- 53° (c 1.0, CHC13). The ultraviolet spectrum in EtOH has three absorption maxima at 236, 287 and 295 nm. The structure has been elucidated by chemical and spectroscopic methods.

Chardon-Loriaux, Husson, Tetrahedron Lett., 1845 (1975)