(4S,5S,6S)-6-ethyl-5-methyl-4-(2-(1-phenyl-1H-tetrazol-5-ylthio)ethyl)-4-(trimethylsilyloxy)-tetrahydropyran-2-one

(2S,3S)-3-(tert-Butyl-dimethyl-silanyloxy)-2-methyl-pentanoyl chloride