英文名称:trisodium 4-hydroxy-7-[[[[5-hydroxy-6-(phenylazo)-7-sulphonato-2-naphthyl]amino]carbonyl]amino]-3-[(6-sulphonato-2-naphthyl)azo]naphthalene-2-sulphonate; C.I. 29165; C.I. Direct Red 4 (VAN); C.I. Direct Red 4, trisodium salt (8CI); 6-{(2E)-2-[1-oxo-6-({[(6E)-5-oxo-6-(2-phenylhydrazinylidene)-7-sulfo-5,6-dihydronaphthalen-2-yl]carbamoyl}amino)-3-sulfonaphthalen-2(1H)-ylidene]hydrazinyl}naphthalene-2-sulfon