3-{[2-(1-tert-butoxycarbonylamino-ethyl)-thiazole-4-carbonyl]-amino}-2-methyl-hexanoic acid 1-({1-[(1-tert-butoxycarbonyl-2-methyl-propyl)-methyl-carbamoyl]-2-phenyl-ethyl}-methyl-carbamoyl)-ethyl ester

(S)-2-(4-{2-[1-(tert-butoxycarbonyl)aminoethyl]-5-methyloxazolyl})-6-methylpyridine-3-carboxylic acid

(S)-2-(4-{2-[1-(tert-butoxycarbonyl)aminoethyl]-5-methyloxazolyl})-6-methylpyridine-3-carboxamide

(S)-ethyl 2-(4-{2-[1-(tert-butoxycarbonyl)aminoethyl]-5-methyloxazolyl})-6-methylpyridine-3-carboxylate

(S)-2-(4-{2-[1-(tert-butoxycarbonyl)aminoethyl]-5-methyloxazolyl})-6-methylpyridine-3-thiocarboxamide