The molecule is a seven-membered oligopeptide comprising L-leucine, L-serine, L-glutamic acid, L-threonine, L-glutamic acid, L-threonine and D-leucine residues coupled in sequence, modified by insertion at the N-terminal position of the flexible and hydrophilic PEG chain 1,13-diamino-4,7,10-trioxatrideacne succinamic acid linker (Ttds).
(2R)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[4-[3-[2-[2-(3-aminopropoxy)ethoxy]ethoxy]propylamino]-4-oxobutanoyl]amino]-4-methylpentanoyl]amino]-3-hydroxypropanoyl]amino]-4-carboxybutanoyl]amino]-3-hydroxybutanoyl]amino]-4-carboxybutanoyl]amino]-3-hydroxybutanoyl]amino]-4-methylpentanoic acid