1,2-cyclopropanedicarboxylic acid, diethyl ester, (1S,2S)- InChI=1/C9H14O4/c1-3-12-8(10)6-5-7(6)9(11)13-4-2/h6-7H,3-5H2,1-2H3/t6-,7-/m0/s diethyl (1S,2S)-cyclopropane-1,2-dicarboxylate