(R)-5-[(2R,4R)-5-(tert-Butyl-diphenyl-silanyloxy)-2,4-dimethyl-pentanoyl]-3-methyl-dihydro-furan-2-one

(5S,6S)-6-[2-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-5-methyl-tetrahydro-pyran-2-one