Abstract
Further studies on the marine sponge Disidea pallesoens gave in addition to the known Disidein ( 4), the unique until now scalarane sesterterpenoid condensed with a hydroxyhydroquinone moiety, two new closely related halogenated sesterterpenoids isolated as triacetates ( 6,7). All the 1H- and 13C-NMR chemical shifts of Disidein triacetate ( 5) were assigned by two-dimensional experiments. Treatment of 5 with chlorine and bromine afforded 6 and 7, respectively. X ray diffraction analysis of 7 has unambiguously determined the absolute stereochemistry of all these molecules.
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