(2S,3S)-ethyl-3-((S)-1-((1-(4-nitrophenyl)-1H-1,2,3-triazol-4-yl)methylamino)-1-oxo-3-(thiazol-4-yl)propan-2-ylcarbamoyl)oxirane-2-carboxylate

(2S,3S)-ethyl-3-((S)-1-((1-(2,6-difluorophenyl)-1H-1,2,3-triazol-4-yl)methylamino)-1-oxo-3-(thiazol-4-yl)propan-2-ylcarbamoyl)oxirane-2-carboxylate

(2S,3S)-ethyl-3-((S)-1-((1-mesityl-1H-1,2,3-triazol-4-yl)methylamino)-1-oxo-3-(thiazol-4-yl)propan-2-ylcarbamoyl)oxirane-2-carboxylate

(2S,3S)-ethyl 3-((S)-1-(2,6-difluorophenylamino)-4-methyl-1-oxopentan-2-ylcarbamoyl)oxirane-2-carboxylate

(2S,3S)-ethyl 3-((S)-1-(4-(4-fluorophenyl)thiazol-2-ylamino)-4-methyl-1-oxopentan-2-ylcarbamoyl)oxirane-2-carboxylate