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