(R)-5-Methoxymethoxy-3-oxo-hexanoic acid tert-butyl ester

(R)-10-((R)-2-Hydroxy-propyl)-9-oxa-1,5-dithia-spiro[5.5]undecan-8-one

((2R,6R)-2-Methoxy-6-methyl-4-oxo-tetrahydro-pyran-2-yl)-acetic acid tert-butyl ester

(R)-9-Methyl-8-oxa-1,4-dithia-spiro[4.5]decan-7-one

((2R,4R,6R)-4-Hydroxy-2-methoxy-6-methyl-tetrahydro-pyran-2-yl)-acetic acid tert-butyl ester