5-Pyrimidinecarboxylic acid,1-[6-[(1,3-benzodioxol-5-ylmethyl)[1-[4-[[bis(1-methylethoxy)phosphinyl]difluoromethyl]phenyl]-2-[(1,1-dimethylethyl)amino]-2-oxoethyl]amino]-6-oxohexyl]-4-(2-chlorophenyl)-1,2,3,4-tetrahydro-6-methyl-2-oxo-,phenylmethyl ester