4(1H)-Isobenzofuranone,3-[(1E)-5-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-2-methyl-1-pentenyl]-7-[2-(1,3-dioxolan-2-yl)ethyl]-3,5,6,7-tetrahydro-6,7-dimethyl-, (6R,7S)-rel- [ 652161-81-4 ]