Indigosol brown IBR

O=[S](OC(C1=CC=CC=C21)=C3C4=NC5=C(C(O[S](=O)(O[Na])=O)=C(C=CC=C6)C6=C7O[S](=O)(O[Na])=O)C7=CC=C5C4=C8C(C3=C2O[S](=O)(O[Na])=O)=NC9=C(C(O[S](=O)(O[Na])=O)=C(C=CC=C%10)C%10=C%11O[S](=O)(O[Na])=O)C%11=CC=C89)(O[Na])=O

[1]Thomas H A. “RAYOLANDA” X and “RAYOLANDA” WD—new fibres of value in textile design by reason of their special dyeing and textile properties[J]. Journal of the Textile Institute Proceedings, 1939, 30 (7) : P181-P200.