英文名称:Direct Black 91; C.I. 30400; C.I. Direct Black 21, trisodium salt; C.I. Direct Black 91; Benzoic acid, 2-(2-(2-amino-6-(2-(4'-(2-(3-carboxy-4-hydroxyphenyl)diazenyl)-3,3'-dimethoxy(1,1'-biphenyl)-4-yl)diazenyl)-5-hydroxy-7-sulfo-1-naphthalenyl)diazenyl)-5-nitro-, sodium