Synonyms: 3H-INDOLIUM, 2-[2-[3-[(1,3-DIHYDRO-1,3,3-TRIMETHYL-2H-INDOL-2-YLIDENE)ETHYLIDENE]-2-(DIPHENYLAMINO)-1-CYCLOPENTEN-1-YL]ETHENYL]-1,3,3-TRIMETHYL-, PERCHLORATE;2-((E)-2-(2-(DIPHENYLAMINO)-3-[(E)-2-(1,3,3-TRIMETHYL-1,3-DIHYDRO-2H-INDOL-2-YLIDENE)ETHYLIDENE]-1-CYCLOPENTEN-1-YL)ETHENYL)-1,3,3-TRIMETHYL-3H-INDOLIUM PERCHLORATE