ethyl 2-<(S)-1-(N-t-butoxycarbonyl)aminoethyl>thiazole-4-carboxylate

methyl 2-({[(benzyloxy)carbonyl]amino}methyl)-5-methyl-1,3-oxazole-4-carboxylate

2-({(S)-2-[(2-{6-Benzyloxymethyl-2-[2-((S)-1-tert-butoxycarbonylamino-ethyl)-5-methyl-oxazol-4-yl]-pyridin-3-yl}-thiazole-4-carbonyl)-amino]-3-methyl-butyrylamino}-methyl)-5-methyl-oxazole-4-carboxylic acid methyl ester

(S)-2-(1-(tert-butoxycarbonylamino)ethyl)-5-methyloxazole-4-carboxylic acid

(S)-methyl 2-(1-((tert-butoxycarbonyl)amino)ethyl)-5-methyloxazole-4-carboxylate