2-[1-(N-tert-butoxycarbonyl-N-methylamino)-2-methylpropyl]thiazole-4-carboxylic acid

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