(-)-ethyl 1,4-dihydro-1-[1(S)-(acetoxymethyl)ethyl]-4-oxo-6,7,8-trifluoroquinoline-3-carboxylate

(+)-ethyl 2-(2-nitro-3,4,5-trifluorobenzoyl)-3-[(1-acetoxyprop-2(S)-yl)amino]acrylate

左氧氟单酯

3-(2,3,4,5-tetrafluorophenyl)-3-oxo-2-(ethoxymethylene)-propanoic acid ethyl ester

(+)-ethyl 2-[[[(S)-1-hydroxyprop-2-yl]amino]methylene]-3-oxo-3-(2,3,4,5-tetrafluorophenyl)propionate