4,4'-Azoxybenzoic acid diethyl ester 6421-04-1 Benzoic acid, 4,4'-azoxybis-, diethyl ester Benzoic acid, 4,4'-azoxydi-, diethyl ester Diethyl 4,4'-azoxybenzoate Diethyl 4,4'-azoxydibenzoate Diethyl azoxybenzene-4,4'-dicarboxylate Diethyl azoxybenzoate Diethyl p,p'-azoxybenzoate NSC401032