(1R,2R)-2-(3-[1,3]Dioxolan-2-yl-propyl)-2-hydroxy-3-methyl-5-oxo-cyclohex-3-enecarboxylic acid methyl ester
(1S,2R)-2-(3-[1,3]Dioxolan-2-yl-propyl)-2-hydroxy-3-methyl-5-oxo-cyclohex-3-enecarboxylic acid methyl ester
2-(3-[1,3]Dioxolan-2-yl-propyl)-3-methyl-5-oxo-cyclohex-2-enecarboxylic acid methyl ester