Various types of tryptamine-iridoid alkaloids from Palicourea acuminata (=Psychotria acuminata, Rubiaceae)

► Four tryptamine-iridoid alkaloids were reported for Palicourea acuminata. ► Structure elucidation of the new compound lagamboside was made using spectroscopic analysis. ► NMR experiments indicated an unusual N-glycosylation of lagamboside.