6-amino-5-methyl-2-[[(1R)-phenylethyl]amino]-4H-3,1-benzoxazin-4-one

3-((S)-2-Benzyloxycarbonylamino-3-methyl-butyrylamino)-2-methyl-6-[(S)-3-phenyl-2-(toluene-4-sulfonylamino)-propionylamino]-benzoic acid 2-trimethylsilanyl-ethyl ester