[(3aS,4E,5S,6aR)-4-ethylidene-2,2-dimethyltetrahydro-3aH-cyclopenta[d][1,3]dioxol-5-yl]acetic acid phenethyl ester

[(3aS,4E,5S,6aR)-4-ethylidene-2,2-dimethyltetrahydro-3aH-cyclopenta[d][1,3]dioxol-5-yl]acetic acid 2-(4-fluorophenyl)ethyl ester

[(3aS,4E,5S,6aR)-4-ethylidene-2,2-dimethyltetrahydro-3aH-cyclopenta[d][1,3]dioxol-5-yl]acetic acid 2-[3-(tert-butyldimethylsilyloxy)phenyl]ethyl ester

[(3aS,4E,5S,6aR)-4-ethylidene-2,2-dimethyltetrahydro-3aH-cyclopenta[d][1,3]dioxol-5-yl]acetic acid 2-[2-(tert-butyldimethylsilyloxy)phenyl]ethyl ester

[(3aS,4E,5S,6aR)-4-ethylidene-2,2-dimethyltetrahydro-3aH-cyclopenta[d][1,3]dioxol-5-yl]acetic acid 3-[4-(tert-butyldimethylsilyloxy)phenyl]propyl ester