2-[(S)-1-((S)-2-tert-Butoxycarbonylamino-3-hydroxy-propionylamino)-ethyl]-thiazole-4-carboxylic acid ethyl ester

2-{(S)-1-[(S)-2-((S)-2-tert-Butoxycarbonylamino-3-methyl-butyrylamino)-3-hydroxy-propionylamino]-ethyl}-thiazole-4-carboxylic acid ethyl ester