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3-[(2Z)-2-[[3-(2-carboxyethyl)-4-methyl-5-[(Z)-(4-methyl-5-oxo-3-vinyl-pyrrol-2-ylidene)methyl]-1H-pyrrol-2-yl]methylene]-4-methyl-5-[(Z)-(3-methyl-5-oxo-4-vinyl-pyrrol-2-ylidene)methyl]pyrrol-3-yl]pr related products: