D-glutamic acid hydrochloride

dimethyl (2R)-2-aminopentanedioate

methyl 3-((2R,5S)-5-isopropyl-3,6-dimethoxy-2,5-dihydropyrazin-2-yl)propanoate

tert-butyl cyclopent-2-ene-1-carbamate

(2R)-2-amino-4-cyanobutanoic acid