(4S,5R)-tert-butyl 4-[4-(ethoxycarbonyl)thiazol-2-yl]-2,2,5-trimethyloxazolidine-3-carboxylate

methyl 2-[1-(1-hydroxyprop-2-ynyl)]thiazole-4-carboxylate

(4R,5R)-tert-butyl 4-cyano-2,2,5-trimethyloxazolidine-3-carboxylate

2-((4S,5R)-3-(tert-butoxycarbonyl)-2,2,5-trimethyloxazolidin-4-yl)thiazole-4-carboxylic acid