英文名称:N-Methyl-N-[4-[[4-(Dimethylamino)Phenyl][5-[(2,4-Dinitrophenyl)Amino]-2-Sulfonato-4-Sodiosulfophenyl]Methylene]-2,5-Cyclohexadien-1-Ylidene]Methanaminium; C.I.42021; N-Methyl-N-[4-[[4-(dimethylamino)phenyl][5-[(2,4-dinitrophenyl)amino]-2-sulfonato-4-sodiosulfophenyl]methylene]-2,5-cyclohexadien-1-ylidene]methanaminium; Alkali Fast Green 3B