2-(2-tert-butoxycarbonylamino-3-methyl-butyrylamino)-3-(tert-butyl-dimethyl-silanyloxy)-4-methoxy-butyric acid methyl ester

2-(1-amino-2-methyl-propyl)-5-methoxymethyl-thiazole-4-carboxylic acid methyl ester

2-(1-{[2-(1-tert-butoxycarbonylamino-2-methylcarbamoyl-ethyl)-5-methyl-thiazole-4-carbonyl]-amino}-2-methyl-propyl)-5-methoxymethyl-thiazole-4-carboxylic acid

2-(1-{[2-(1-amino-2-methylcarbamoyl-ethyl)-5-methyl-thiazole-4-carbonyl]-amino}-2-methyl-propyl)-5-methoxymethyl-thiazole-4-carboxylic acid allyl ester