3-methyl-5-[1-methyl-2(RSS)-phenylsulfinyl-(1S)-ethyl]-2-oxo-(4R,5R)-1,3-oxazolan-4-yl-methylacetate

3-methyl-5-[1-methyl-2-(4-methylphenylsulfonyloxy)-(1R)-ethyl]-2-oxo-(4R,5R)-1,3-oxazolan-4-ylmethylacetate