methyl (3S)-3-(tert-butyldimethylsilyloxy)-4,4-dimethyl-5-oxo-heptanoate

(-)-(3S)-3-(tert-butyldimethylsilyl)oxy-4,4-dimethyl-5-oxoheptanoic acid

(S)-phenyl 5-((tert-butyldimethylsilyl)oxy)-3-hydroxy-2,2-dimethylpentanoate