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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-L-glutaminyl-L-isoleucyl-L-prolyl-L-proline related products: