reserpine, vinblastine, and catharanthine.1 The genus
Bousigonia, comprising two species, belongs to the Apocynaceae
family and is distributed mainly in China, Laos, and Vietnam.2
Previous chemical investigations of B. mekongensis resulted in
the isolation of two new eburnamine-aspidospermine-type
bisindole alkaloids, mekongenines A and B.3