for the following products
(2R,3S)-3-(n-Boc-amino)-1-oxirane-4-phenylbutane | (2R,3S)-3-(tert-Boc)amino-1,2-epoxy-4-phenylbutane | (2S,3R)-1,2-Epoxy-3-(Boc-amino)-4-phenylbutane | [(1S)-1-(2R)-Oxiranyl-2-phenylethyl]-carbamic acid 1,1-dimethylethyl ester and (2R,3S)-3-(tert-Butoxycarbonyl)amino-1,2-epoxy-4-phenylbutane
