Dinohydrazides A and B, Novel Hydrazides from a Symbiotic Marine Dinoflagellate

Abstract Dinohydrazides A (1) and B (2), novel naturally-occurring dibenzoylhydrazines, were isolated from a symbiotic marine dinoflagellate of Okinawan sponge. Their structures were determined by spectroscopic analyses and synthetic methods. They moderately inhibited the growth of mammalian cells.