(4E)-3,5,5-trimethyl-4-[(2E,4E,6E,8E,10E,12E,14E,16E,18E)-3,7,12,16-te tramethyl-18-(2,6,6-trimethyl-4-oxo-1-cyclohex-2-enylidene)octadeca-2, 4,6,8,10,12,14,16-octaenylidene]cyclohex-2-en-1-one