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N-{[(2S,5R,8S,11S,14S,17S)-11-(4-aminobutyl)-8-(2-carboxyethyl)-2-[(1R)-1-hydroxyethyl]-5,14-bis(hydroxymethyl)-3,6,9,12,15,20-hexaoxo-1,4,7,10,13,16-hexaazacycloicosan-17-yl]carbonyl}-L-threonyl-L-prolyl-L-leucyl-L-valyl-L-threonylleucine