127680-56-2
(3R,4R)-4-acetoxy-3-[(R)-1-formyloxyethyl]-2-azetidinone
→
114418-65-4
(3S,4R)-3-[(R)-1-hydroxyethyl]-4-[(S)-1-(4,4-dimethyl-2-oxazolidone-3-carbonyl)ethyl]-2-azetidinone