3H-Indolium, 1-(5-carboxypentyl)-2-[(1E,3E,5E)-5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadien-1-yl]-3,3-dimethyl-
3H-Indolium, 1-(5-carboxypentyl)-2-[(1E,3E,5E)-5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadien-1-yl]-3,3-dimethyl-