Synonyms: 2-Naphthalenesulfonicacid,7-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-4-hydroxy-3-[(2-sulfophenyl)azo]-,disodium salt (9CI); 2-Naphthalenesulfonic acid,7-[(4,6-dichloro-s-triazin-2-yl)amino]-4-hydroxy-3-[(o-sulfophenyl)azo]-,disodium salt (7CI); C.I. Reactive Orange 1, disodium salt (8CI); Orange M-GS;Procion Orange GS