Synonyms: 3H-INDOLIUM, 2-[2-[3-[(1,3-DIHYDRO-1,3,3-TRIMETHYL-2H-INDOL-2-YLIDENE)ETHYLIDENE]-2-PHENYL-1-CYCLOPENTEN-1-YL]ETHENYL]-1,3,3-TRIMETHYL-, PERCHLORATE;1,3,3-TRIMETHYL-2-(2-(2-PHENYL-3-(2-(1,3,3-TRIMETHYL-1H-2(3H)- INDOLIDENE)ETHYLIDENE)-1-CYCLOPENTENYL)ETHENYL)-3H-INDOLIUM PERCHLORATE;1,3,3-TRIMETHYL-2-(2-(2-PHENYL-3-[2-(1,3,3-TRIMETHYL-2,3-DIHYDRO-1H-2-INDOLYLIDEN)ETHYLIDENE]-1-CYCLOPENTENYL)-1-ETHENYL)-3H-INDOLIUM PERCHLORIDE;2-[2-[3-[(1,3-Dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)ethylidene]-2-phenyl-1-cyclopenten-1-yl]ethenyl]-1,3,3-trimethyl-3H-indolium perchlorate