products of the toxins, and an X-ray crystallographic analysis of 19, 21-dibromoaplysiatoxin show that the absolute configurations of the ten asymmetriccarbons are 3S, 4fi, 7S, 9S, 10S, llfi, 12S, 15S, 29R, 30fi. The 31-nor compound, oscillatoxin
Optical and proton NMR spectral studies of the aplysiatoxinsand derivatives, degradation products of the toxins, and an X-ray crystallographic analysis of 19, 21-dibromoaplysiatoxin show that the absolute configurations of the ten asymmetriccarbons are 3S, 4fi, 7S, 9S, 10S, llfi, 12S, 15S, 29R, 30fi. The 31-nor compound, oscillatoxin