methyl 5-benzyloxycarbonylamino-3-bromo-6-methoxypyridine-2-carboxylate

methyl 5-benzyloxycarbonylamino-3,6-dimethoxypyridine-2-carboxylate

methyl (5S)-5-benzyloxycarbonylamino-3-bromo-6-oxo-1-hydropyridine-2-carboxylate

methyl (5S)-5-benzyloxycarbonylamino-3-bromo-6-oxo-,4,5-trihydropyridine-2-carboxylate

benzyl (S)-4-(((2S,3S,5S)-5-(methoxycarbonyl)-3-(phenylsulfonyl)pyrrolidin-2-yl)methyl)-2,2-dimethyloxazolidine-3-carboxylate