Pentoxifylline6493-05-637 % similar Aminophylline317-34-036 % similar 2-Methoxy-1,7,9-trimethylpurine-6,8-dione51168-26-435 % similar Paraxanthine611-59-635 % similar Theobromine83-67-035 % similar Oxtriphylline4499-40-533 % similar 1,3-Dipropyl-7-methylxanthine31542-63-933 % similar 3-Methyl-5-beta-D-ribofuranosyl-2,4(1H,3H)-pyrimidinedione81691-06-731 % similar 1,3-Dimethyluric acid944-73-030 % similar Englate8000-10-030 % similar