2,3-Didehydro-7-ethyl-7α-hydroxy-4,8-cyclo-20,21-dinoraspidospermidine-3-carboxylic acid methyl ester

This alkaloid is fairly widespread among a number of Pandaca species but is primarily obtained from P. caducifolia. It furnishes colourless prisms from MeOH and is optically active having a specific rotation of [α]_D + 350° (MeOH). The structure has been determined from chemical and spectroscopic evidence.

LeMen et al., Tetrahedron Lett., 3119 (1974)