8-(3-hydroxy-propyl)-1,3,7-trimethyl-3,7-dihydro-purine-2,6-dione

(1,3,7-trimethyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-yl)-malonic acid diethyl ester

ethyl-(1,3,7-trimethyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-yl)-malonic acid diethyl ester