papilioerythrinone

(organic chemistry) A carotenoid (6S)-6-hydroxy-2,4,4-trimethyl-3-[(1E,3E,5E,7E,9E,11E,13E,15E,17E)-3,7,12,16-tetramethyl-18-[(1R)-2,6,6-trimethyl-4-oxocyclohex-2-en-1-yl]octadeca-1,3,5,7,9,11,13,15,17-nonaenyl]cyclohex-2-en-1-one in the kin and feathers of birds