3'-([3S-(3α,3aα,7aβ)]-3-(1,1-dimethylethoxy)-2,3,3a,4,7,7a-hexahydro-3a-methyl-1H-inden-5-yl)propionic acid ethyl ester

2-[2-([3S-(3α,3aα,7aβ)]-3-(1,1-dimethylethoxy)-2,3,3a,4,7,7a-hexahydro-3a-methyl-1H-inden-5-yl)ethyl]-2-methyl[1,3]dioxolane