(S)-1-Allyl-5-[(3aR,5S,6R,6aR)-5-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-6-yl]-pyrrolidin-2-one

Methanesulfonic acid (R)-1-[(3aR,5S,6R,6aR)-6-((S)-1-allyl-5-oxo-pyrrolidin-2-yl)-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl]-2-methanesulfonyloxy-ethyl ester

(S)-1-Allyl-5-[(3aR,5S,6R,6aR)-5-((R)-1,2-dihydroxy-ethyl)-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-6-yl]-pyrrolidin-2-one

(S)-1-Allyl-5-((3aR,5R,6R,6aR)-2,2-dimethyl-5-vinyl-tetrahydro-furo[2,3-d][1,3]dioxol-6-yl)-pyrrolidin-2-one

(S)-4-Azido-4-[(3aR,5S,6R,6aR)-5-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-6-yl]-butyraldehyde