7-benzyl-2-(3-hydroxypropylamino)-1-propylpurin-6-one
7-benzyl-2-(2-hydroxyethylamino)-1-propylpurin-6-one
3-benzyl-5-propyl-5,7,8,9-tetrahydro-3H-1,3,5,6,9a-pentaaza-cyclopenta[a]naphthalen-4-one
3-benzyl-5-propyl-7,8-dihydro-3H,5H-1,3,5,6,8a-pentaaza-as-indacen-4-one
7-benzyl-2-chloro-1-propylxanthine