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

(S)-2-(2-benzyloxycarbonyl-1-tert-butoxycarbonylaminoethyl)-5-methylthiazole-4-carboxylic acid methyl ester

(S)-5-methoxymethyl-2-[2-methyl-1-(tritylamino)propyl]-thiazole-4-carboxylic acid ethyl ester

2-((S)-1-tert-butoxycarbonylamino-2-methyl-propyl)-thiazole-4-carboxylic acid ethyl ester

(S)-2-(1-amino-2-methylpropyl)thiazole-4-carboxylic acid ethyl ester