4-[5-(8-cyclopentyl-2,6-dioxo-1-propyl-7H-purin-3-yl)pentanoyl]benzenesulfonyl fluoride
4-[5-(8-cyclopentyl-2,6-dioxo-1-propyl-7H-purin-3-yl)-1-oxopentyl]benzenesulfonyl fluoride
4-[5-(8-cyclopentyl-2,6-diketo-1-propyl-7H-purin-3-yl)pentanoyl]benzenesulfonyl fluoride