Synonyms: 3H-INDOLIUM, 2-[2-[5-[(1,3-DIHYDRO-1,3,3-TRIMETHYL-2H-INDOL-2-YLIDENE)ETHYLIDENE]-5,6-DIHYDRO-2H-PYRAN-3-YL]ETHENYL]-1,3,3-TRIMETHYL-, TETRAFLUOROBORATE(1-);1,3,3-TRIMETHYL-2-((E)-2-[5-[(Z)-2-(1,3,3-TRIMETHYL-1,3-DIHYDRO-2H-INDOL-2-YLIDENE)ETHYLIDENE]-2H-PYRAN-3(6H)-YL]ETHENYL)-3H-INDOLIUM TETRAFLUOROBORATE