(1R,2R)-1,2-dimethylcycloheptane InChI=1/C9H18/c1-8-6-4-3-5-7-9(8)2/h8-9H,3-7H2,1-2H3/t8-,9-/m1/s cycloheptane, 1,2-dimethyl-, (1R,2R)-