Convolutindole A and convolutamine H, new nematocidal brominated alkaloids from the marine bryozoan Amathia convoluta.

Nematocidal activity of an extract of the marine bryozoan Amathia convoluta, collected from Tasmania's east coast, was ascribed to two novel tribrominated alkaloids: convolutamine H (2) and convolutindole A (5), an indole possessing the unusual N-methoxy moiety. The structures were established by spectroscopic techniques.