3,5,7,9,11,13,15,17-Octadecaoctaen-2-one,18-[(1R,2R,4S)-2,4-dihydroxy-2,6,6-trimethylcyclohexylidene]-3,7,12,16-tetramethyl-,(3E,5E,7E,9E,11E,13E,15E,17R)- (9CI)