AIDS-059641 AIDS059641 CNG Cyclic Cyanoguanidine deriv. Q8247 [4R-(4.alpha.,5.alpha.,6.beta.,7.beta.)]-Hexahydro-5,6-dihydroxy-1,3,4,7-tetrakis(phenylmethyl)-2H-1,3-diazepin-2-ylidene]cyanamide