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