(4.alpha.,5.alpha.,6.beta.,7.beta.)-N-[3-[[3-[[(Cyanomethyl)amino]cabonyl]phenyl]methyl]hexahydro-5,6-dihydroxy-2-oxo-4,7-bis(phenylmethyl)-1H-1,3-diazepin-1yl]methyl]benzoyl]glycine AIDS-057007 AIDS057007 Cyclic urea deriv.