4-(2-(5-(1-(6-((2,5-二氧代吡咯烷-1-基)氧基)-6-氧代己基)-3,3-二甲基-3H-吲哚-1-鎓-2-基)戊-2,4-二烯-1-亚基)-3,3-二甲基吲哚啉-1-基)丁-1-磺酸内盐

4-(2-(5-(1-(6-((2,5-Dioxopyrrolidin-1-yl)oxy)-6-oxohexyl)-3,3-dimethyl-3H-indol-1-ium-2-yl)penta-2,4-dien-1-ylidene)-3,3-dimethylindolin-1-yl)butane-1-sulfonate