Chemical Formula: C26H39N5O6
Chemical Formula C26H39N5O6
Found 97 metabolite its formula value is C26H39N5O6
Ile Ile Ser Trp
(2S)-2-[(2S)-2-[(2S,3S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-methylpentanamido]-3-hydroxypropanamido]-3-(1H-indol-3-yl)propanoic acid
Ile Ile Trp Ser
(2S)-2-[(2S)-2-[(2S,3S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxypropanoic acid
Ile Leu Ser Trp
(2S)-2-[(2S)-2-[(2S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-4-methylpentanamido]-3-hydroxypropanamido]-3-(1H-indol-3-yl)propanoic acid
Ile Leu Trp Ser
(2S)-2-[(2S)-2-[(2S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-4-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxypropanoic acid
Ile Ser Ile Trp
(2S)-2-[(2S,3S)-2-[(2S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-hydroxypropanamido]-3-methylpentanamido]-3-(1H-indol-3-yl)propanoic acid
Ile Ser Leu Trp
(2S)-2-[(2S)-2-[(2S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-hydroxypropanamido]-4-methylpentanamido]-3-(1H-indol-3-yl)propanoic acid
Ile Ser Trp Ile
(2S,3S)-2-[(2S)-2-[(2S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-hydroxypropanamido]-3-(1H-indol-3-yl)propanamido]-3-methylpentanoic acid
Ile Ser Trp Leu
(2S)-2-[(2S)-2-[(2S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-hydroxypropanamido]-3-(1H-indol-3-yl)propanamido]-4-methylpentanoic acid
Ile Thr Val Trp
(2S)-2-[(2S)-2-[(2S,3R)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-hydroxybutanamido]-3-methylbutanamido]-3-(1H-indol-3-yl)propanoic acid
Ile Thr Trp Val
(2S)-2-[(2S)-2-[(2S,3R)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-hydroxybutanamido]-3-(1H-indol-3-yl)propanamido]-3-methylbutanoic acid
Ile Val Thr Trp
(2S)-2-[(2S,3R)-2-[(2S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-methylbutanamido]-3-hydroxybutanamido]-3-(1H-indol-3-yl)propanoic acid
Ile Val Trp Thr
(2S,3R)-2-[(2S)-2-[(2S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-methylbutanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxybutanoic acid
Ile Trp Ile Ser
(2S)-2-[(2S,3S)-2-[(2S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-methylpentanamido]-3-hydroxypropanoic acid
Ile Trp Leu Ser
(2S)-2-[(2S)-2-[(2S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-4-methylpentanamido]-3-hydroxypropanoic acid
Ile Trp Ser Ile
(2S,3S)-2-[(2S)-2-[(2S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxypropanamido]-3-methylpentanoic acid
Ile Trp Ser Leu
(2S)-2-[(2S)-2-[(2S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxypropanamido]-4-methylpentanoic acid
Ile Trp Thr Val
(2S)-2-[(2S,3R)-2-[(2S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxybutanamido]-3-methylbutanoic acid
Ile Trp Val Thr
(2S,3R)-2-[(2S)-2-[(2S)-2-[(2S,3S)-2-amino-3-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-methylbutanamido]-3-hydroxybutanoic acid
Leu Ile Ser Trp
(2S)-2-[(2S)-2-[(2S,3S)-2-[(2S)-2-amino-4-methylpentanamido]-3-methylpentanamido]-3-hydroxypropanamido]-3-(1H-indol-3-yl)propanoic acid
Leu Ile Trp Ser
(2S)-2-[(2S)-2-[(2S,3S)-2-[(2S)-2-amino-4-methylpentanamido]-3-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxypropanoic acid
Leu Leu Ser Trp
(2S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-4-methylpentanamido]-4-methylpentanamido]-3-hydroxypropanamido]-3-(1H-indol-3-yl)propanoic acid
Leu Leu Trp Ser
(2S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-4-methylpentanamido]-4-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxypropanoic acid
Leu Ser Ile Trp
(2S)-2-[(2S,3S)-2-[(2S)-2-[(2S)-2-amino-4-methylpentanamido]-3-hydroxypropanamido]-3-methylpentanamido]-3-(1H-indol-3-yl)propanoic acid
Leu Ser Leu Trp
(2S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-4-methylpentanamido]-3-hydroxypropanamido]-4-methylpentanamido]-3-(1H-indol-3-yl)propanoic acid
Leu Ser Trp Ile
(2S,3S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-4-methylpentanamido]-3-hydroxypropanamido]-3-(1H-indol-3-yl)propanamido]-3-methylpentanoic acid
Leu Ser Trp Leu
(2S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-4-methylpentanamido]-3-hydroxypropanamido]-3-(1H-indol-3-yl)propanamido]-4-methylpentanoic acid
Leu Thr Val Trp
(2S)-2-[(2S)-2-[(2S,3R)-2-[(2S)-2-amino-4-methylpentanamido]-3-hydroxybutanamido]-3-methylbutanamido]-3-(1H-indol-3-yl)propanoic acid
Leu Thr Trp Val
(2S)-2-[(2S)-2-[(2S,3R)-2-[(2S)-2-amino-4-methylpentanamido]-3-hydroxybutanamido]-3-(1H-indol-3-yl)propanamido]-3-methylbutanoic acid
Leu Val Thr Trp
(2S)-2-[(2S,3R)-2-[(2S)-2-[(2S)-2-amino-4-methylpentanamido]-3-methylbutanamido]-3-hydroxybutanamido]-3-(1H-indol-3-yl)propanoic acid
Leu Val Trp Thr
(2S,3R)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-4-methylpentanamido]-3-methylbutanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxybutanoic acid
Leu Trp Ile Ser
(2S)-2-[(2S,3S)-2-[(2S)-2-[(2S)-2-amino-4-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-methylpentanamido]-3-hydroxypropanoic acid
Leu Trp Leu Ser
(2S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-4-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-4-methylpentanamido]-3-hydroxypropanoic acid
Leu Trp Ser Ile
(2S,3S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-4-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxypropanamido]-3-methylpentanoic acid
Leu Trp Ser Leu
(2S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-4-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxypropanamido]-4-methylpentanoic acid
Leu Trp Thr Val
(2S)-2-[(2S,3R)-2-[(2S)-2-[(2S)-2-amino-4-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxybutanamido]-3-methylbutanoic acid
Leu Trp Val Thr
(2S,3R)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-4-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-methylbutanamido]-3-hydroxybutanoic acid
Ser Ile Ile Trp
(2S)-2-[(2S,3S)-2-[(2S,3S)-2-[(2S)-2-amino-3-hydroxypropanamido]-3-methylpentanamido]-3-methylpentanamido]-3-(1H-indol-3-yl)propanoic acid
Ser Ile Leu Trp
(2S)-2-[(2S)-2-[(2S,3S)-2-[(2S)-2-amino-3-hydroxypropanamido]-3-methylpentanamido]-4-methylpentanamido]-3-(1H-indol-3-yl)propanoic acid
Ser Ile Trp Ile
(2S,3S)-2-[(2S)-2-[(2S,3S)-2-[(2S)-2-amino-3-hydroxypropanamido]-3-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-methylpentanoic acid
Ser Ile Trp Leu
(2S)-2-[(2S)-2-[(2S,3S)-2-[(2S)-2-amino-3-hydroxypropanamido]-3-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-4-methylpentanoic acid
Ser Leu Ile Trp
(2S)-2-[(2S,3S)-2-[(2S)-2-[(2S)-2-amino-3-hydroxypropanamido]-4-methylpentanamido]-3-methylpentanamido]-3-(1H-indol-3-yl)propanoic acid
Ser Leu Leu Trp
(2S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-3-hydroxypropanamido]-4-methylpentanamido]-4-methylpentanamido]-3-(1H-indol-3-yl)propanoic acid
Ser Leu Trp Ile
(2S,3S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-3-hydroxypropanamido]-4-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-methylpentanoic acid
Ser Leu Trp Leu
(2S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-3-hydroxypropanamido]-4-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-4-methylpentanoic acid
Ser Trp Ile Ile
(2S,3S)-2-[(2S,3S)-2-[(2S)-2-[(2S)-2-amino-3-hydroxypropanamido]-3-(1H-indol-3-yl)propanamido]-3-methylpentanamido]-3-methylpentanoic acid
Ser Trp Ile Leu
(2S)-2-[(2S,3S)-2-[(2S)-2-[(2S)-2-amino-3-hydroxypropanamido]-3-(1H-indol-3-yl)propanamido]-3-methylpentanamido]-4-methylpentanoic acid
Ser Trp Leu Ile
(2S,3S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-3-hydroxypropanamido]-3-(1H-indol-3-yl)propanamido]-4-methylpentanamido]-3-methylpentanoic acid
Ser Trp Leu Leu
(2S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-3-hydroxypropanamido]-3-(1H-indol-3-yl)propanamido]-4-methylpentanamido]-4-methylpentanoic acid
Thr Ile Val Trp
(2S)-2-[(2S)-2-[(2S,3S)-2-[(2S,3R)-2-amino-3-hydroxybutanamido]-3-methylpentanamido]-3-methylbutanamido]-3-(1H-indol-3-yl)propanoic acid
Thr Ile Trp Val
(2S)-2-[(2S)-2-[(2S,3S)-2-[(2S,3R)-2-amino-3-hydroxybutanamido]-3-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-methylbutanoic acid
Thr Leu Val Trp
(2S)-2-[(2S)-2-[(2S)-2-[(2S,3R)-2-amino-3-hydroxybutanamido]-4-methylpentanamido]-3-methylbutanamido]-3-(1H-indol-3-yl)propanoic acid
Thr Leu Trp Val
(2S)-2-[(2S)-2-[(2S)-2-[(2S,3R)-2-amino-3-hydroxybutanamido]-4-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-methylbutanoic acid
Thr Val Ile Trp
(2S)-2-[(2S,3S)-2-[(2S)-2-[(2S,3R)-2-amino-3-hydroxybutanamido]-3-methylbutanamido]-3-methylpentanamido]-3-(1H-indol-3-yl)propanoic acid
Thr Val Leu Trp
(2S)-2-[(2S)-2-[(2S)-2-[(2S,3R)-2-amino-3-hydroxybutanamido]-3-methylbutanamido]-4-methylpentanamido]-3-(1H-indol-3-yl)propanoic acid
Thr Val Trp Ile
(2S,3S)-2-[(2S)-2-[(2S)-2-[(2S,3R)-2-amino-3-hydroxybutanamido]-3-methylbutanamido]-3-(1H-indol-3-yl)propanamido]-3-methylpentanoic acid
Thr Val Trp Leu
(2S)-2-[(2S)-2-[(2S)-2-[(2S,3R)-2-amino-3-hydroxybutanamido]-3-methylbutanamido]-3-(1H-indol-3-yl)propanamido]-4-methylpentanoic acid
Thr Trp Ile Val
(2S)-2-[(2S,3S)-2-[(2S)-2-[(2S,3R)-2-amino-3-hydroxybutanamido]-3-(1H-indol-3-yl)propanamido]-3-methylpentanamido]-3-methylbutanoic acid
Thr Trp Leu Val
(2S)-2-[(2S)-2-[(2S)-2-[(2S,3R)-2-amino-3-hydroxybutanamido]-3-(1H-indol-3-yl)propanamido]-4-methylpentanamido]-3-methylbutanoic acid
Thr Trp Val Ile
(2S,3S)-2-[(2S)-2-[(2S)-2-[(2S,3R)-2-amino-3-hydroxybutanamido]-3-(1H-indol-3-yl)propanamido]-3-methylbutanamido]-3-methylpentanoic acid
Thr Trp Val Leu
(2S)-2-[(2S)-2-[(2S)-2-[(2S,3R)-2-amino-3-hydroxybutanamido]-3-(1H-indol-3-yl)propanamido]-3-methylbutanamido]-4-methylpentanoic acid
Val Ile Thr Trp
(2S)-2-[(2S,3R)-2-[(2S,3S)-2-[(2S)-2-amino-3-methylbutanamido]-3-methylpentanamido]-3-hydroxybutanamido]-3-(1H-indol-3-yl)propanoic acid
Val Ile Trp Thr
(2S,3R)-2-[(2S)-2-[(2S,3S)-2-[(2S)-2-amino-3-methylbutanamido]-3-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxybutanoic acid
Val Leu Thr Trp
(2S)-2-[(2S,3R)-2-[(2S)-2-[(2S)-2-amino-3-methylbutanamido]-4-methylpentanamido]-3-hydroxybutanamido]-3-(1H-indol-3-yl)propanoic acid
Val Leu Trp Thr
(2S,3R)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-3-methylbutanamido]-4-methylpentanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxybutanoic acid
Val Thr Ile Trp
(2S)-2-[(2S,3S)-2-[(2S,3R)-2-[(2S)-2-amino-3-methylbutanamido]-3-hydroxybutanamido]-3-methylpentanamido]-3-(1H-indol-3-yl)propanoic acid
Val Thr Leu Trp
(2S)-2-[(2S)-2-[(2S,3R)-2-[(2S)-2-amino-3-methylbutanamido]-3-hydroxybutanamido]-4-methylpentanamido]-3-(1H-indol-3-yl)propanoic acid
Val Thr Trp Ile
(2S,3S)-2-[(2S)-2-[(2S,3R)-2-[(2S)-2-amino-3-methylbutanamido]-3-hydroxybutanamido]-3-(1H-indol-3-yl)propanamido]-3-methylpentanoic acid
Val Thr Trp Leu
(2S)-2-[(2S)-2-[(2S,3R)-2-[(2S)-2-amino-3-methylbutanamido]-3-hydroxybutanamido]-3-(1H-indol-3-yl)propanamido]-4-methylpentanoic acid
Val Trp Ile Thr
(2S,3R)-2-[(2S,3S)-2-[(2S)-2-[(2S)-2-amino-3-methylbutanamido]-3-(1H-indol-3-yl)propanamido]-3-methylpentanamido]-3-hydroxybutanoic acid
Val Trp Leu Thr
(2S,3R)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-3-methylbutanamido]-3-(1H-indol-3-yl)propanamido]-4-methylpentanamido]-3-hydroxybutanoic acid
Val Trp Thr Ile
(2S,3S)-2-[(2S,3R)-2-[(2S)-2-[(2S)-2-amino-3-methylbutanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxybutanamido]-3-methylpentanoic acid
Val Trp Thr Leu
(2S)-2-[(2S,3R)-2-[(2S)-2-[(2S)-2-amino-3-methylbutanamido]-3-(1H-indol-3-yl)propanamido]-3-hydroxybutanamido]-4-methylpentanoic acid
Trp Ile Ile Ser
(2S)-2-[(2S,3S)-2-[(2S,3S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-methylpentanamido]-3-methylpentanamido]-3-hydroxypropanoic acid
Trp Ile Leu Ser
(2S)-2-[(2S)-2-[(2S,3S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-methylpentanamido]-4-methylpentanamido]-3-hydroxypropanoic acid
Trp Ile Ser Ile
(2S,3S)-2-[(2S)-2-[(2S,3S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-methylpentanamido]-3-hydroxypropanamido]-3-methylpentanoic acid
Trp Ile Ser Leu
(2S)-2-[(2S)-2-[(2S,3S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-methylpentanamido]-3-hydroxypropanamido]-4-methylpentanoic acid
Trp Ile Thr Val
(2S)-2-[(2S,3R)-2-[(2S,3S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-methylpentanamido]-3-hydroxybutanamido]-3-methylbutanoic acid
Trp Ile Val Thr
(2S,3R)-2-[(2S)-2-[(2S,3S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-methylpentanamido]-3-methylbutanamido]-3-hydroxybutanoic acid
Trp Leu Ile Ser
(2S)-2-[(2S,3S)-2-[(2S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-4-methylpentanamido]-3-methylpentanamido]-3-hydroxypropanoic acid
Trp Leu Leu Ser
(2S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-4-methylpentanamido]-4-methylpentanamido]-3-hydroxypropanoic acid
Trp Leu Ser Ile
(2S,3S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-4-methylpentanamido]-3-hydroxypropanamido]-3-methylpentanoic acid
Trp Leu Ser Leu
(2S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-4-methylpentanamido]-3-hydroxypropanamido]-4-methylpentanoic acid
Trp Leu Thr Val
(2S)-2-[(2S,3R)-2-[(2S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-4-methylpentanamido]-3-hydroxybutanamido]-3-methylbutanoic acid
Trp Leu Val Thr
(2S,3R)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-4-methylpentanamido]-3-methylbutanamido]-3-hydroxybutanoic acid
Trp Ser Ile Ile
(2S,3S)-2-[(2S,3S)-2-[(2S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-hydroxypropanamido]-3-methylpentanamido]-3-methylpentanoic acid
Trp Ser Ile Leu
(2S)-2-[(2S,3S)-2-[(2S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-hydroxypropanamido]-3-methylpentanamido]-4-methylpentanoic acid
Trp Ser Leu Ile
(2S,3S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-hydroxypropanamido]-4-methylpentanamido]-3-methylpentanoic acid
Trp Ser Leu Leu
(2S)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-hydroxypropanamido]-4-methylpentanamido]-4-methylpentanoic acid
Trp Thr Ile Val
(2S)-2-[(2S,3S)-2-[(2S,3R)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-hydroxybutanamido]-3-methylpentanamido]-3-methylbutanoic acid
Trp Thr Leu Val
(2S)-2-[(2S)-2-[(2S,3R)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-hydroxybutanamido]-4-methylpentanamido]-3-methylbutanoic acid
Trp Thr Val Ile
(2S,3S)-2-[(2S)-2-[(2S,3R)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-hydroxybutanamido]-3-methylbutanamido]-3-methylpentanoic acid
Trp Thr Val Leu
(2S)-2-[(2S)-2-[(2S,3R)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-hydroxybutanamido]-3-methylbutanamido]-4-methylpentanoic acid
Trp Val Ile Thr
(2S,3R)-2-[(2S,3S)-2-[(2S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-methylbutanamido]-3-methylpentanamido]-3-hydroxybutanoic acid
Trp Val Leu Thr
(2S,3R)-2-[(2S)-2-[(2S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-methylbutanamido]-4-methylpentanamido]-3-hydroxybutanoic acid
Trp Val Thr Ile
(2S,3S)-2-[(2S,3R)-2-[(2S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-methylbutanamido]-3-hydroxybutanamido]-3-methylpentanoic acid
Trp Val Thr Leu
(2S)-2-[(2S,3R)-2-[(2S)-2-[(2S)-2-amino-3-(1H-indol-3-yl)propanamido]-3-methylbutanamido]-3-hydroxybutanamido]-4-methylpentanoic acid