Paraxanthine611-59-6100 % similar Caffeine58-08-253 % similar 1H-Purine-2,6-dione, 3,7-dihydro-1,3,7-trimethyl-, hydrate (1:1)5743-12-449 % similar 2,6-Dichloro-7-methyl-7H-purine2273-93-048 % similar 7-Methylxanthine552-62-546 % similar 1-Methylxanthine6136-37-445 % similar Theobromine83-67-045 % similar 6-Chloro-3-methyl-2,4(1H,3H)-pyrimidinedione4318-56-336 % similar Etofylline519-37-936 % similar 7-Methyladenine935-69-335 % similar Proxyphylline603-00-935 % similar Acefylline652-37-935 % similar 1,3-Dipropyl-7-methylxanthine31542-63-934 % similar 7-Methylguanine578-76-733 % similar 3,7-Dihydro-1,3,7,8-tetramethyl-1H-purine-2,6-dione832-66-633 % similar Diprophylline479-18-533 % similar Theacrine2309-49-133 % similar 1-Methyl-1H-imidazole-4,5-dicarboxylic acid19485-38-232 % similar 3-Methyl-5-β-D-ribofuranosyl-2,4(1H,3H)-pyrimidinedione81691-06-732 % similar Doxofylline69975-86-631 % similar