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N~5~-(diaminomethylidene)-N~2~-{[(2S)-1-(L-alpha-glutamyl-L-tryptophyl)-2,5-dihydro-1H-pyrrol-2-yl]carbonyl}-L-ornithyl-L-prolyl-N~1~-{(2S,3S)-1-[(2S)-2-{[(2S)-2-carboxy-2,5-dihydro-1H-pyrrol-1-yl]car related products: