N-((1E,3E,5Z)-5-(phenylimino)penta-1,3-dien-1-yl)benzenaminium chloride 、 3-(5-carboxypentyl)-4,6-diiodo-1,2,3-trimethyl-3H-indolium iodide 以10%的产率得到3-(5-carboxypentyl)-2-{7-[3-(5-carboxypentyl)-4,6-diiodo-1,3-dimethyl-2,3-dihydro-1H-2-indolyliden]-1,3,5-heptatrienyl}-4,6-diiodo-1,3-dimethyl-3H-indolium iodide