Molluscicidal Activity of Naphthylisoquinoline Alkaloids fromTriphyophyllumandAncistrocladusSpecies*

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Abstract
The naphthylisoquinoline alkaloids dioncophylline A (1) and 5′-O-demethyl-8-O-methyl-7-epi-dioncophylline A (2) represent a new structural type of molluscicidal compounds and the active principle of extracts of the tropical lianas Ancistrocladus abbreviates and Triphyophyllum peltatum. The activity of 1 was further improved by derivatization.