2-((R)-1-{[2-((S)-1-tert-Butoxycarbonylamino-2-methyl-propyl)-thiazole-4-carbonyl]-amino}-2-methyl-propyl)-thiazole-4-carboxylic acid ethyl ester

(S)-2-[2-methyl-1-(tritylamino)propyl]-thiazole-4-carboxylic acid ethyl ester

2-((S)-1-{(2S,3R)-3-Hydroxy-2-[(2-phenyl-thiazole-4-carbonyl)-amino]-butyrylamino}-2-methyl-propyl)-thiazole-4-carboxylic acid

2-((S)-1-{[2-((R)-1-tert-Butoxycarbonylamino-2-methyl-propyl)-thiazole-4-carbonyl]-amino}-2-methyl-propyl)-thiazole-4-carboxylic acid

(S)-2-(1-{[2-(1-{[2-(1-{[2-(1-tert-butoxycarbonylamino-2-methylpropyl)thiazole-4-carbonyl]amino}-(S)-2-methylpropyl)thiazole-4-carbonyl]amino}-(S)-2-methylpropyl)thiazole-4-carbonyl]amino}-(S)-2-methylpropyl)thiazole-4-carboxylic acid ethyl ester