methyl (4R,4'S,4''S)-4,4',4''-trimethyl-2''-((S)-4-methyl-2-oxothiazolidin-4-yl)-4,4',4'',5,5',5''-hexahydro-[2,4':2',4''-terthiazole]-4-carboxylate

methyl (R)-2-((tert-butoxycarbonyl)amino)-2-methyl-3-(((S)-4-methyl-2-phenyl-4,5-dihydrothiazole-4-carbonyl)thio)propanoate

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

methyl (4R,4'S,4''S)-4,4',4''-trimethyl-2''-phenyl-4,4',4'',5,5',5''-hexahydro-[2,4':2',4''-terthiazole]-4-carboxylate

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