6-amino-9-(3-(bromomethyl)benzyl)-2-(1H-pyrazol-1-yl)-7,9-dihydro-8H-purin-8-one

diethyl (3-((6-amino-8-oxo-2-(1H-pyrazol-1-yl)-7,8-dihydro-9H-purin-9-yl)methyl)benzyl)phosphonate

(3-((6-amino-8-oxo-2-(1H-pyrazol-1-yl)-7,8-dihydro-9H-purin-9-yl)methyl)benzyl)phosphonic acid