(2S,3S)-ethyl 3-((S)-1-(4-(4-fluorophenylsulfonamido)butylamino)-4-methyl-1-oxopentan-2-ylcarbamoyl)oxirane-2-carboxylate

(2S,3S)-ethyl 3-((2S)-1-((5-(1,2-dithiolan-3-yl)pentanamido)methylamino)-4-methyl-1-oxopentan-2-ylcarbamoyl)oxirane-2-carboxylate

(2S,3R)-ethyl 3-((S)-4-methyl-1-oxo-1-(4-(5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamido)butylamino)pentan-2-ylcarbamoyl)oxirane-2-carboxylate

(2S,3S)-ethyl 3-((S)-3-(1H-imidazol-5-yl)-1-oxo-1-(phenylamino)propan-2-ylcarbamoyl)oxirane-2-carboxylate

(2S,3S)-ethyl 3-((S)-3-(1H-imidazol-5-yl)-1-(mesitylamino)-1-oxopropan-2-ylcarbamoyl)oxirane-2-carboxylate