Hymenin, a novel α-adrenoceptor blocking agent from the Okinawan marine spongeHymeniacidon sp.

Abstract
A novel bromine-containing alkaloid, hymenin, has been isolated from the Okinawan marine spongeHymeniacidon sp. as a potent α-adrenoceptor blocking agent and its structure determined to be1 on the basis of the spectral data.