Benzenesulfonicacid, 3,3'-[carbonylbis[imino(3-methoxy-4,1-phenylene)azo]]bis- (9CI);Benzenesulfonic acid, 3,3'-[ureylenebis[(3-methoxy-p-phenylene)azo]]di- (8CI);N,N'-Bis[2-methoxy-4-(3-sulfophenylazo)phenyl]urea
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