Ptolemy after 150 AD Andromeda · Aquarius · Aquila · Ara · Argo Navis · Aries · Auriga · Boötes · Cancer · Canis Major · Ursa Minor Vela Virgo Volans Vulpecula v t e Carotenoids Lycopene Alpha-Carotene (α-Carotene) β-Carotene γ-Carotene δ-Carotene ε-Carotene Carotenes (C[40]) ζ-Carotene Neurosporene Phytoene Phytofluene Torulene Lycopersene Antheraxanthin Astaxanthin Canthaxanthin Citranaxanthin Cryptoxanthin Diadinoxanthin Diatoxanthin Dinoxanthin Echinenone Xanthophylls (C[40]) Flavoxanthin Fucoxanthin Lutein Neoxanthin Rhodoxanthin Rubixanthin Violaxanthin Zeaxanthin Zeinoxanthin Abscisic acid Apocarotenal Bixin Apocarotenoids (C[<40]) Crocetin Food orange 7 Ionones Peridinin Retinal Vitamin A retinoids (C[20]) Retinoic acid Retinol Tretinoin Acitretin Alitretinoin Bexarotene Retinoid drugs Etretinate Fenretinide Isotretinoin Tazarotene Temarotene Zuretinol acetate