Syonyms Name: C.I. 22610; C.I. Direct Blue 6; C.I. Direct Blue 6, tetrasodium salt; C.I. Direct Blue 6, tetrasodium salt; (3Z)-5-amino-3-({4'-[(2E)-2-(8-amino-1-oxo-3,6-disulfonaphthalen-2(1H)-ylidene)hydrazino]biphenyl-4-yl}hydrazono)-4-oxo-3,4-dihydronaphthalene-2,7-