5H-Inden-5-one, 1-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-4-[2-(1,3-dioxolan-2-yl)ethyl]-1,2,3,6,7,7a-hexahydro-7a-methyl-, (1S,7aS)-
5H-Inden-5-one, 1-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-4-[2-(1,3-dioxolan-2-yl)ethyl]-1,2,3,6,7,7a-hexahydro-7a-methyl-, (1S,7aS)-