Synonyms: 1H-Carbazolium, 9-(2-(5-chloro-1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)ethylidene)-2,3,4,4a,9,9a-hexahydro-, chloride (1:1);1H-Carbazolium, 9-((5-chloro-1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)ethylidene)-2,3,4,4a,9,9a-hexahydro-, chloride;9-((5-Chloro-1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)ethylidene)-2,3,4,4a,9,9a-hexahydro-1H-carbazolium chloride;(9Z)-9-[2-(5-chloro-1,3,3-trimethyl-1,3-dihydro-2H-indol-2-ylidene)ethylidene]-2,3,4,9-tetrahydro-1H-carbazolium chloride