L-threo-Pentonamide, N-(1-((((4-amino-2-methyl-5-pyrimidinyl)methyl)amino)carbonyl)-2-methylbutyl)-5-cyclohexyl-2,4,5-trideoxy-4-((N-(N-((1,1-dimethylethoxy)carbonyl)-L-phenyl-2,6-t2-alanyl)glycyl)amino)-, (S-(R*,R*))-