2,5-Cyclohexadien-1-one, 2,6-dichloro-4-(3,5-dichloro-4-oxo-2,5-cyclohexadien-1-ylidene)- 27728-29-6 3,3'5,5'-Tetrachlorodiphenoquinone 68076-35-7 NSC 97139 TCDPQ