Novel acyl glyco-carotenoic acids, diapolycopenedioic acid xylosyl esters A, B, and C, were isolated as red pigments by using chromatographic methods from a marine bacterium, Rubritalea squalenifaciens, belonging to subdivision 1 of Verrucomicrobia. The structures of these diapolycopenedioic acid xylosyl esters were determined to be 4-[2-O-acyl-b -D-xylopyranosyl] hydrogen 4,4Ј-diapo-Y ,Y -carotene-4,4Ј-dioate by spectroscopic analysis. Diapolycopenedioic acid xylosyl ester A showed potent antioxidative activity in a 1 O 2 suppression model.

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Terpenes U 0200 4-Ketoantheraxanthin, a Novel Carotenoid Produced by the Combination of the Bacterial Enzyme β-Carotene Ketolase CrtW and Endogenous Carotenoid Biosynthetic Enzymes in Higher Plants. -The title compound exhibits potent antioxidative activity, presumably due to its C4-keto function. -(SHINDO*, K.; HASUNUMA, T.; ASAGI, E.; SANO, A.; HOTTA, E.; MINEMURA, N.; MIYAKE, C.; MAOKA, T.; MISAWA, N.; Tetrahedron Lett. 49 (2008) 20, 3294-3296; Dep. Food Nutr., Japan Women's Univ., Bunkyo, Tokyo 112, Japan; Eng.) -R. Simon 35-171

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