From the leaves of Ancistrocladus cochinchinensis, besides the already known ancistrocladinine, the new naturally occurring alkaloids, 6-O-methylhamateine, hamatinine, 6-O-methylhamatinine, 6-O-demethyl-7-epi-ancistrobrevine D, 7-epi-ancistrobrevine D and 6-O-demethyl-8-O-methyl-7-epi-ancistrobrevine D have been isolated and their structures elucidated from spectroscopic data and chemical degradation. (C) Elsevier Science Ltd.