1,3-thiazol-5-ylmethyl [(1S,2S)-1-benzyl-3-(1-benzyl-2-{(2S)-3-methyl-2-[(methyl{[2-(1-methylethyl)-1,3-oxazol-4-yl]methyl}carbamoyl)amino]butanoyl}hydrazino)-2-hydroxypropyl]carbamate (non-preferred name)