methyl (2E,4E,6Z,8E,10E,12E,14E,16E)-2,6,11,15-tetramethyl-17-(2,6,6-trimethylcyclohexen-1-yl)heptadeca-2,4,6,8,10,12,14,16-octaenoate 、
(1R,3S)-1-acetyl-1,2,2-trimethyl-3-trimethylsilyloxy cyclopentane 以65%的产率得到(2'R,5'R)-8'-hydroxy-2'trimethylsilyloxy-β,κ-caroten-6'-one