5-(3-fluorooxetan-3-yl)-4-[(1S)-2,2,2-trifluoro-1-methyl-ethoxy]pyridine-2-carboxylic acid 、
ethyl 2-amino-2-(5-methyl-1,2,4-oxadiazol-3-yl)propanoate 以isolated (283 mg, purity: 86%, 57%)的产率得到ethyl 2-[[5-(3-fluorooxetan-3-yl)-4-[(1S)-2,2,2-trifluoro-1-methyl-ethoxy]pyridine-2-carbonyl]amino]-2-(5-methyl-1,2,4-oxadiazol-3-yl)propanoate