((S)-1-phenylethyl)-D-valine

L-青霉胺

(R,S)-3-methyl-2-(1-phenylethylamino)butyronitrile

(3R,6R)-2,5-diethoxy-3-isopropyl-6-methyl-3,6-dihydropyrazine

(3R,6R)-2,5-diethoxy-6-isopropyl-3-(1'-13C)-acetyl-3-methyl-6-hydropyrazine