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

(2S,3S)-ethyl-3-((S)-1-(1-(benzo[d][1,3]dioxol-5-yl-1H-1,2,3-triazol-4-yl)methylamino)-1-oxo-3-(thiazol-4-yl)propan-2-ylcarbamoyl)oxirane-2-carboxylate

(2S,3S)-2-Dibenzylamino-3-fluoro-succinic acid diethyl ester