(R)-6-[(R)-2-(tert-Butyl-dimethyl-silanyloxy)-propyl]-3,6-dihydro-pyran-2-one

(S)-6-[(R)-2-(tert-Butyl-dimethyl-silanyloxy)-propyl]-3,6-dihydro-pyran-2-one

(R)-1-((R)-6-oxo-3,6-dihydro-2H-pyran-2-yl)propan-2-yl 3-(3,4-bis((tert-butyldimethylsilyl)oxy)phenyl)propanoate

3-[3,4-Bis-(tert-butyl-dimethyl-silanyloxy)-phenyl]-propionic acid (S)-1-methyl-2-((S)-6-oxo-3,6-dihydro-2H-pyran-2-yl)-ethyl ester

(R)-6-((S)-2-Hydroxy-propyl)-3,6-dihydro-pyran-2-one