(Bi-1,4-cyclohexadien-1-yl)-3,3',6,6'-tetrone, 4,4'-dimethyl- (8CI)(9CI) 3-07-00-04758 (Beilstein Handbook Reference) 4388-07-2 5,5'-Bi-p-toluquinone BRN 2455300 NSC 11851