英文名称:C.I. Direct Blue 31, trisodium salt (8CI); C.I. 23690; C.I. Direct Blue 31; trisodium (3Z)-3-({3,3'-dimethyl-4'-[(2Z)-2-(1-oxo-4-sulfonatonaphthalen-2(1H)-ylidene)hydrazino]biphenyl-4-yl}hydrazono)-5-hydroxy-4-oxo-3,4-dihydronaphthalene-2,7-disulfonate; (3E)-3-({3,3'-dimethyl-4'-[(2E)-2-(1-oxo-4-