benzyl [(2S)-1-({(1R,2S)-1-[(10S,13R)-9,12-dioxo-10-(propan-2-yl)-2,5-dioxa-8,11,14-triazabicyclo[14.3.1]icosa-1(20),16,18-trien-13-yl]-1-hydroxy-3-phenylpropan-2-yl}amino)-3-methyl-1-oxobutan-2-yl]carbamate