Pentanedioic acid,4-[[[1-(diethoxyphosphinyl)-2,2-dimethylpropyl](1,1-dimethylethyl)amino]oxy]-2,2-dimethyl-,5,5'-[2-[4-(2-carboxy-2-methylpropyl)-6,7-bis(1,1-dimethylethyl)-8-ethoxy-8-oxido-3-oxo-2,5,9-trioxa-6-aza-8-phosphaundec-1-yl]-2-(hydroxyethyl)-1