[3S-(1Z, 3a,5b)]-[2-{3,5-bis-{[(1,1-dimethylethyl)-dimethylsilyl]-oxy}-2-methylenecyclohexylidene}-ethyl] -diphenyl phosphine oxide

[3S-(1Z, 3a,5b)]-[2-{3,5-bis-{[(1,1-dimethylethyl)-dimethylsilyl]-oxy}-2-methylenecyclohexylidene}-ethyl] -diphenyl phosphine oxide