1,3,3,1',3',3'-Hexamethylindodicarbocyanine iodide 36536-22-8 3H-Indolium, 2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadienyl]-1,3,3-trimethyl-, iodide NSC340302