4-Methoxy-5-[2-(6-methoxy-4-nitro-3-sulfophenyl)-5-(N-phenylcarbamoyl)(1,2,3,4-tetraazol-3-yl)]-2-nitrobenzenesulfonic acid AIDS-013833 AIDS013833 Benzenesulfonic acid, 3,3'-[(phenylamino)carbonyl]-3,4-tetra- zolium]bis(4-methoxy-6-nitro) NSC601519