2-(3-(3,3-Dimethyl-1-(6-oxo-6-(prop-2-yn-1-ylamino)hexyl)-5-sulfoindolin-2-ylidene)prop-1-en-1-yl)-1-ethyl-3,3-dimethyl-5-sulfo-3H-indol-1-ium
2-(5-(3,3-Dimethyl-1-(6-oxo-6-(prop-2-yn-1-ylamino)hexyl)-5-sulfoindolin-2-ylidene)penta-1,3-dien-1-yl)-1-ethyl-3,3-dimethyl-3H-indol-1-ium-5-sulfonate
Prop-2-yne-1-sulfonic acid
