IUPAC:1-{6-[(2,5-dioxopyrrolidin-1-yl)oxy]-6-oxohexyl}-3,3-dimethyl-2-[5-(1,3,3-trimethyl-5-sulfo-2,3-dihydro-1H-indol-2-ylidene)penta-1,3-dien-1-yl]-3H-indol-1-ium-5-sulfonate potassium
IUPAC:1-{6-[(2,5-dioxopyrrolidin-1-yl)oxy]-6-oxohexyl}-3,3-dimethyl-2-[5-(1,3,3-trimethyl-5-sulfo-2,3-dihydro-1H-indol-2-ylidene)penta-1,3-dien-1-yl]-3H-indol-1-ium-5-sulfonate potassium