Abstract
Two new polycyclic aromatic alkaloids, biemnadin ( 1) and 8,9-dihydro-11-hydroxyascididemin ( 2), have been isolated from the Okinawan marine sponge Biemna sp. The X-ray diffraction analysis of 1 has established its octacyclic structure and the structure of 2 elucidated on the basis of extensive spectroscopic and chemical studies.
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