(2011/02/24)
(-)-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
(1S,4R)-(-)-methyl-[[(1,1-dimethylethoxy)carbonyl]amino]cyclopent-2-ene-1-carboxylate
(–)-methyl (1S,4R)-4-aminocyclopent-2-ene-1-carboxylate hydrochloride