CAS No 63958-90-7 , (2S)-4-amino-2-[[(2S)-2-[[2-[[2-[[(2S)-5-amino-2-[[(2S)-2-[[(2S)-6-
amino-2-[[(2S)-2-[[(2S)-5-oxopyrrolidine-2-carbonyl]amino]propanoyl]
amino]hexanoyl]amino]-3-hydroxypropanoyl]amino]-5-oxopentanoyl]amino]
acetyl]amino]acetyl]amino]-3-hydroxypropanoyl]amino]-4-oxobutanoic acid