3H-Indolium, 2-[3-[1,3-dihydro-3,3-dimethyl-1-[6-oxo-6-(2-propyn-1-ylamino)hexyl]-5-sulfo-2H-indol-2-ylidene]-1-propen-1-yl]-1,3,3-trimethyl-5-sulfo-, inner salt
3H-Indolium, 1-(5-carboxypentyl)-2-[2-[3-[2-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)ethylidene]-1-cyclohexen-1-yl]ethenyl]-3,3-dimethyl-, inner salt