A New N-Carboxyindole Alkaloid from the Marine Sponge Rhaphisia pallida

A new indole alkaloid pallidin ( 1 ), together with the two known compounds, cyclo( l -pro- l -leu) and 1,3-dimethylxanthine, were isolated from the sponge Rhaphisia pallida . The structures of these metabolites were defined by spectroscopic methods.