(3aR,5S,6S,6aR)-5-((S)-1-Methoxy-ethyl)-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-6-ol

(2S,3R,5R)-5-((S)-1-Methoxy-ethyl)-tetrahydro-furan-2,3-diol

(3aR,6aR)-5-((S)-1-Methoxy-ethyl)-2,2-dimethyl-3a,6a-dihydro-furo[2,3-d][1,3]dioxole