2,3,4,5,6,6-Hexachloro-2,4-cyclohexadien-1-one 2,3,4,5,6,6-Hexachloro-2,4-cyclohexadienone 2,4-Cyclohexadien-1-one, 2,3,4,5,6,6-hexachloro- 21306-21-8 Hexachloro-C6one