The molecule is polyoxin C in which the primary amino group has been condensed with L-tryptophan to form a peptide bond.
(2S)-2-[[(2S)-2-amino-3-(1H-indol-3-yl)propanoyl]amino]-2-[(2R,3S,4R,5R)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxyoxolan-2-yl]acetic acid