6439-85-6 AIDS-030084 AIDS030084 NSC86139 Pyrimido[5,4-g]pteridine-2,4,6,8(1H,3H,7H,9H)- tetrone, 1,3,7,9-tetramethyl- Pyrimido[5,4-g]pteridine-2,4,6,8(1H,3H,7H,9H)-tetrone, 1,3,7,9-tetramethyl-