QDX qdx (2P)-4-({6-[({[(3aS,4R,7R,10aS)-2,6-diamino-10,10-dihydroxy-3a,4,9,10-tetrahydro-3H,8H-pyrrolo[1,2-c]purin-4-yl]methoxy}carbonyl)amino]hexyl}carbamoyl)-2-{[4aP,9(9a)P]-6-hydroxy-3-oxo-3H-xanthen-9-yl}benzoic acid QDX