1t,3c-Dimethyl-cyclopentan, dimethyl-2,4 cyclopentadiene, 1,3-dimethyl-cyclopentane, 1,3-dimethyl-cyclopentadiene, 1,3-dimethyl transcyclopentane, 2,4-dimethyl cyclopentane, 2,4-dimethyl-1,3-pentadiene, 1,3-dimethyl-1,3-cyclopentadiene, trans-1,3-Dimethyl-cyclopentan, 1,3-Cyclopentadiene,1,3-dimethyl