Synonyms: Cyclopentanone,2,5-bis[(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)ethylidene]- (9CI);Cyclopentanone, 2,5-bis[2-(1,3,3-trimethyl-2-indolinylidene)ethylidene]- (8CI);2,5-Bis[2-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)ethylidene]-cyclopentanone;Cyclopentanone, 2,5-bis[2-(1,3,3-trimethyl-2-indolinylidene)ethylidene]-;cyclopentanone,2,5-bis[(1,3-dihydro-1,3,3-trimethyl-2h-indol-2-ylidene)ethylid;