PhosphoraMidous acid, bis(1-Methylethyl)-, 6-[[5-[(3aS,4S,6aR)-1-[bis(4-Methoxyphenyl)phenylMethyl]hexahydro-2- oxo-1H-thieno[3,4-d]iMidazol-4-yl]-1-oxopentyl]aMino]hexyl 2-cyanoethyl ester