112256-77-6
(3S,4S)-4-[(S)-1-benzyloxyethyl]-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-1-di-p-anisylmethyl-2-azetidinone
→
~95%
112256-76-5
(3S,4S)-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-1-di-p-anisylmethyl-4-[(S)-1-hydroxyethyl]-2-azetidinone