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Two new cytotoxic diterpenoids, plumarellide (1) and the ethyl ester of plumarellic acid (2), were isolated from the alcoholic extract of the gorgonian coral Plumarella sp. and their structures were established by NMR, EIMS, MALDI TOF MS, IR and UV spectroscopy.
(6S,10S)-3,10-Dimethyl-7,11-dimethylidenespiro[5,5]undec-2-en-4-one (1), a new rearranged chamigrane-type sesquiterpenoid with two sp 2 -hybridized carbons in α-positions to the spiro-atom, was isolated from the alcoholic extract of the sea hare Aplysia sp. and its structure and absolute configuration were established by chemical transformations, NMR, EIMS, IR, UV and CD spectroscopy.
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