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(2007/10/03)(4-nitrophenyl)methyl (4R,5R,6S)-3-[(diphenoxyphosphinyl)oxy]-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate
(5S)-2,2-dimethyl-3-(2-mercaptoethyl)-1,3-diazabicyclo[3.3.0]octan-4-one
L-prolinamide
Thioacetic acid S-[2-((S)-3,3-dimethyl-1-oxo-tetrahydro-pyrrolo[1,2-c]imidazol-2-yl)-ethyl] ester
(5S)-2,2-dimethyl-1,3-diazabicyclo<3.3.0>octan-4-one