1,2-cyclopropanedicarboxylic acid, dimethyl ester, (1R,2S)- InChI=1/C7H10O4/c1-10-6(8)4-3-5(4)7(9)11-2/h4-5H,3H2,1-2H3/t4-,5 dimethyl (1R,2S)-cyclopropane-1,2-dicarboxylate