78506-80-6 BENZOIC ACID, 4,4'-(5-BENZYLIDENE-2,4,6-TRIOXOHEXAHYDROPYRIMIDIN-1,3-DIYL)BIS(2- Barbituric acid, 1,3-bis(4-carboxy-3-nitrophenyl)-5-benzylidene-, dipotassium salt Benzoic acid, 4,4'-(5-benzylidene-2,4,6-trioxohexahydropyrimidin-1,3-diyl)bis(2-nitro-, dipotassium salt