bis[3-[(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)ethylidene]-9-ethyl-3H-carbazolium] sulphate;3H-Carbazolium, 3-[(1,3-dihydro-1,3,3-trimethyl- 2H-indol-2-ylidene)ethylidene]-9-ethyl-, sulfate (2:1)
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