Three new carotenoids with a 3,4-dihydroxy-beta-end group were isolated from the oyster Crassostrea gigas. These structures were determined to be 3,4,3',8'-tetrahydroxy-beta,kappa-caroten-6'-one (1), 3,4-dihydroxy-3',6'-epoxy-1',2',5',6'7',8'-hexahydro-6'-methyl-16'-nor-beta,-carotene-1',8'-dione (2), and 3,6-epoxy-5,3',4'-trihydroxy-12',13',20'-trinor-beta,beta-caroten-19,11-olide (3) based on chemical and spectral data.
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Maoka et al. (2005) studied this question.
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