Enantioselective hydrolysis of dimethyl 2.alpha.,3.alpha.-[(dimethylmethylene)dioxy]-5.beta.-hydroxy-1.beta.,4.beta.-cyclopentanedicarboxylate with pig liver esterase. Stereoselective synthesis of methyl 2(R),3(S)-[(dimethylmethylene)dioxy]-5(R)-hydroxy-1(S)-carboxy-4(R)-cyclopentanecarboxylate. A cyclopentane synthone with all ring atoms chiral