3d image of lutein skeletal formula

lutein xanthophyll pigment carotenoid green leafy vegetables spinach kale yellow carrots non-photochemical quenching xanthophyll cycle retina macula lutea zeaxanthin isomeric stereoisomer chromophore saponification de-esterification golden oriole evening grosbeak warbler common yellowthroat javan magpie macula three-color vision retinal eye macular degeneration supplement biological activity bioactive nutrient prescription drug food additive nutraceutica dietary age-related amd cataract research anti-aging healthy aging alternative medicine tcm traditional chinese herbal 3d molecular formula skeletal