Synonyms: 3H-Indolium,2-[5-(1,3-dihydro-1,3,3- trimethyl-2H-indol-2-ylidene)-1,3-pentadienyl]- 1,3,3-trimethyl-,perchlorate;NK 2670;1,3,3-trimethyl-2-[(1E,3E)-5-(1,3,3-trimethyl-1,3-dihydro-2H-indol-2-ylidene)-1,3-pentadienyl]-3H-indolium perchlorate;1,1',3,3,3',3'-Hexamethylindodicarbocyanine perchlorate;3H-Indolium, 2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadienyl]-1,3,3-trimethyl-, perchlorate (9CI);