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Astacene is a carotenoid pigment found in many plants and fish.

ChEBI: A carotenone that consists of beta,beta-carotene bearing four oxo substituents at positions 2, 2', 4 and 4'.

A probable impurity is astaxanthin (3,3’-dihydroxy-,-carotene-4,4’-dione). Purify astacin by chromatography on alumina/fibrous clay (1:4