2,2,7,7-tetrachloro-4-methylcyclohept-4-en-1-one 4-cyclohepten-1-one, 2,2,7,7-tetrachloro-4-methyl- InChI=1/C8H8Cl4O/c1-5-2-3-7(9,10)6(13)8(11,12)4-5/h2H,3-4H2,1H