3H-Indolium, 2-[2-[2-(diphenylamino)-3-[[1-ethyl-1,3-dihydro-3,3-dimethyl-5-(trifluoro methyl)-2H-indol-2-ylidene]ethylidene]-1-cyclopenten-1-yl]ethenyl]-1-eth yl-3,3-dimethyl-5-(trifluoromethyl)-,