1,3-Diazepine deriv. AIDS-043312 AIDS043312 XV655 [4R-(4.alpha.,5.alpha.,6.beta.,7.beta.)]-3-[[Hexahydro-5,6-dihydroxy-2-oxo-3,4,7-tris(phenylmethyl)-1H-1,3-diazepin-1-yl]methyl]-N-2-thiazolylbenzamide