.alpha.-Carotene-3,3',19-triol, 7,8-dihydro-8-oxo-;.beta.,.epsilon.-Carotene-3,3',19-triol, 7,8-dihydro-8-oxo-;(3R,3'R,6'R)-3,3',19-trihydroxy-4',5'-didehydro-5',6',7,8-tetrahydro-β,β-caroten-8-one
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