Synonyms: Biphenyl,3,3'-dimethoxy-4,4'-bis[[a-[(p-nitrophenyl)hydrazono]benzyl]azo]- (6CI,7CI); Diazene,1,1'-(3,3'-dimethoxy[1,1'-biphenyl]-4,4'-diyl)bis[2-[[(4-nitrophenyl)hydrazono]phenylmethyl]-(9CI); Formazan,1,1'-(3,3'-dimethoxy-4,4'-biphenylylene)bis[5-(p-nitrophenyl)-3-phenyl- (8CI);Formazan, 1,1'-(3,3'-dimethoxy[1,1'-biphenyl]-4,4'-diyl)bis[5-(4-nitrophenyl)-3-phenyl-;NBT Diformazan; Nitro Blue Diformazan; Nitro-BT Diformazan; Nitro-Blue Formazan