Syonyms Name: C.I. 22590; C.I. Direct Blue 2; C.I. Direct Blue 2 (VAN); C.I. Direct Blue 2, trisodium salt; C.I. Direct Blue 2, trisodium salt (8CI); 5-amino-3-[[4'-[(7-amino-1-hydroxy-3-sulfo-2-naphthyl)azo][1,1'-biphenyl]-4-yl]azo]-4-hydroxy-2,7-Naphthalenedisulfonic