15743-13-2 2,2,4,5-tetrachlorocyclopent-4-ene-1,3-dione 4-cyclopentene-1,3-dione, 2,2,4,5-tetrachloro- InChI=1/C5Cl4O2/c6-1-2(7)4(11)5(8,9)3(1)1