Synonyms: Polypeptin;N~2~-[(2S)-4-amino-2-(formylamino)butanoyl]-N-[(1S)-3-amino-1-{[(3S,6S,9S,12S,15R,18S,21S)-6,9,18-tris(2-aminoethyl)-3-[(1R)-1-hydroxyethyl]-12-[(1S)-1-methylpropyl]-15-(2-methylpropyl)-2,5,8,11,14,17,20-heptaoxo-1,4,7,10,13,16,19-heptaazacyclotricosan-21-yl]carbamoyl}propyl]-L-threoninamide