4-(acetylsulfanyl)-5-(tert-butyldiphenylsilyloxy)-2-fluoropentanoic acid methyl ester

(3R,5S)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-3-fluoro-3-phenylselanyl-dihydro-thiophen-2-one

Acetic acid (3R,5S)-5-(tert-butyl-diphenyl-silanyloxymethyl)-3-fluoro-3-phenylselanyl-tetrahydro-thiophen-2-yl ester