(2E,4E,6E,8E,10E,12E,14E,16E)-17-[(4R)-4-hydroxy-2,6,6-trimethyl-1-cyclohexenyl]-2,6,11,15-tetramethylheptadeca-2,4,6,8,10,12,14,16-octaenal (2E,4E,6E,8E,10E,12E,14E,16E)-17-[(4R)-4-hydroxy-2,6,6-trimethyl-1-cyclohexenyl]-2,6,11,15-tetramethyl-heptadeca-2,4,6,8,10,12,14,16-octaenal