p. 1463 - 1467
(2011/03/23)(2S,3R)-methyl 3-(benzyloxy)-2-((1S,2R,4S,5R)-4-(tert-butoxycarbonylamino)-6-oxabicyclo [3.1.0] hexane-2-carboxamido)butanoate
(2S,3R)-N-Fmoc-O-benzyl-threonine methyl ester
(-)-2-azabicyclo[2.2.1]hept-5-en-3-one
tert-butyl (1R,4S)-(-)-3-oxo-2-azabicyclo[2.2.1]hept-5-ene-2-carboxylate
(2S,3R)-Fmoc-O-benzyl-threonine