Ethyl ester of beta-apo-8'-carotenic acid Synonyms: Food orange 7;Ethyl 8'-apo-beta,psi-carotenoate;E160f Molecular formula:C32H44O2 CAS number:1109-11-1 Food orange 7, the ethyl ester of beta-apo-8'-carotenic acid, is a carotenoid with an orange-red color. It is found in small quantities in some plants, but is often produced commercially from apocarotenal (E160e). It is used as a food coloring under the E number E160f.