(3S,4S)-4-((3aR,5R,6R,6aS)-6-Iodo-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl)-3-phenoxy-1-((E)-3-phenyl-allyl)-azetidin-2-one

(3R,4R)-1-Allyl-4-((3aR,5R,6R,6aS)-6-iodo-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl)-3-phenoxy-azetidin-2-one

(3S,4S)-3-Benzyloxy-4-((3aR,5R,6R,6aS)-6-iodo-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl)-1-((E)-3-phenyl-allyl)-azetidin-2-one