(R)-methyl 6,8-difluorochroman-3-ylcarbamate

(R)-2-amino-3-(2,4-difluorophenoxy)propionic acid

ethyl (S)-(1-chloro-3-(2,4-difluorophenoxy)-1-oxopropan-2-yl)carbamate

(S)-3-(2,4-difluorophenoxy)-2-((ethoxycarbonyl)amino)propanoic acid

(R)-6,8-difluorochroman-3-amine L-tartrate salt