1,2,3,4-tetrachloro-5,5-dimethoxycyclopenta-1,3-diene 1,3-cyclopentadiene, 1,2,3,4-tetrachloro-5,5-dimethoxy- InChI=1/C7H6Cl4O2/c1-12-7(13-2)5(10)3(8)4(9)6(7)11/h1-2H