(4E)-3,5,5-trimethyl-4-[(2E,4E,6E,8E,10E,12E,14E,16E,18E)-3,7,12,16-tetramethyl-18-(2,6,6-trimethyl-4-oxocyclohex-2-en-1-ylidene)octadeca-2,4,6,8,10,12,14,16-octaenylidene]cyclohex-2-en-1-one

Rhodoxanthin is a xanthophyll pigment with a purple color that is found in small quantities in a variety of plants including Taxus baccata. It is also found in the feathers of some birds. As a food additive it is used under the E number E161f as a food coloring; it is not approved for use in the EU or USA however is approved in Australia and New Zealand (where it is listed under its INS number 161f).