methyl (4R,4'S)-4,4'-dimethyl-2'-phenyl-4,4',5,5'-tetrahydro-[2,4'-bithiazole]-4-carboxylate

(4R,4'S)-4,4'-dimethyl-2'-phenyl-4,4',5,5'-tetrahydro-[2,4'-bithiazole]-4-carboxylic acid

methyl (R)-2-((tert-butoxycarbonyl)amino)-2-methyl-3-(((S)-4-methyl-2-oxothiazolidine-4-carbonyl)thio)propanoate

methyl (R)-2-((S)-3-(tert-butoxycarbonyl)-4-methyl-2-oxothiazolidin-4-yl)-4-methyl-4,5-dihydrothiazole-4-carboxylate

methyl (R)-2-((S)-2-((tert-butoxycarbonyl)amino)-1-mercaptopropan-2-yl)-4-methyl-4,5-dihydrothiazole-4-carboxylate