tert-Butyl (4R-cis)-6-formaldehydel-2,2-dimethyl-1,3-dioxane-4-acetate (CAS NO.124752-23-4) also can be called (4R-cis)-6-Formaldehydel-2,2-dimethyl-1,3-dioxane-4-acetic acid 1,1-dimethylethyl ester ; and (3R,5S)-6-Oxo-3,5-O-diisopropylidene-3,5-dihydroxyhexanoic acid tert-butyl ester .