AIDS-059646 AIDS059646 CNG Cyclic Cyanoguanidine deriv. Q8255 [4R-(4.alpha.,5.alpha.,6.beta.,7.beta.)]-Hexahydro-5,6-dihydroxy-1,3-bis[(3-cyanophenyl)methyl]-4,7-bis(phenylmethyl)-2H-1,3-diazepin-2-ylidene]cyanamide