A novel antagonist of serotonergic receptors, hymenidin, isolated from the Okinawan marine spongeHymeniacidon sp.

Abstract
A novel bromine-containing pyrrole compound, hymenidin, has been isolated from the Okinawan marine spongeHymeniacidon sp. as a potent antagonist of serotonergic receptors and its structure elucidated using spectral data.