2,4(1H,3H)-pteridinedione, 6-(1-oxopropyl)- 6-propionylpteridine-2,4(1H,3H)-dione InChI=1/C9H8N4O3/c1-2-5(14)4-3-10-7-6(11-4)8(15)13-9(16)12-7/h3H,2H2,1H3,(H2,10,12,13,15,16