4-[(2,6-dioxo-1,3-dipropyl-7H-purin-8-yl)carbamoyl]benzenesulfonyl fluoride
4-[[(2,6-dioxo-1,3-dipropyl-7H-purin-8-yl)amino]-oxomethyl]benzenesulfonyl fluoride
4-[(2,6-diketo-1,3-dipropyl-7H-purin-8-yl)carbamoyl]benzenesulfonyl fluoride