1,3-cycloheptanedicarboxylic acid, dimethyl ester, (1R,3S)- InChI=1/C11H18O4/c1-14-10(12)8-5-3-4-6-9(7-8)11(13)15-2/h8-9H,3-7H2,1-2H3/t8-,9 dimethyl (1R,3S)-cycloheptane-1,3-dicarboxylate