3-(2-(Hydroxy(oxido)amino)phenyl)-5-(4-(4-(3-(2-(hydroxy(oxido)amino)phenyl)-4,6-dioxo-2-phenyl-3a,4,6,6a-tetrahydro-5H-2.lambda.~5~-pyrrolo[3,4-d]isoxazol-5-yl)benzyl)phenyl)-2-phenyl-3aH-2.lambda.~5~-py\trrolo[3,4-d]isoxazole-4,6(5H,6aH)-dione AIDS-136956 AIDS136956 NSC640253