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4-ethyl-2-[[5-[[5-[(4-ethyl-3,5-dimethyl-pyrrol-2-ylidene)methyl]-3,4-dimethyl-1H-pyrrol-2-yl]methyl]-3,4-dimethyl-1H-pyrrol-2-yl]methylene]-3,5-dimethyl-pyrrole dihydrobromide related products: