Theobromine83-67-0100 % similar 3,7-Dihydro-3-methyl-7-propyl-1H-purine-2,6-dione55242-64-363 % similar Caffeine58-08-249 % similar 7-Methylxanthine552-62-546 % similar 1H-Purine-2,6-dione, 3,7-dihydro-1,3,7-trimethyl-, hydrate (1:1)5743-12-445 % similar Paraxanthine611-59-645 % similar 8-Bromo-7-(2-butyn-1-yl)-3,7-dihydro-3-methyl-1H-purine-2,6-dione666816-98-442 % similar 7-Methylguanine578-76-742 % similar 6-Amino-1-methyl-5-nitroso-2,4(1H,3H)-pyrimidinedione6972-78-742 % similar 1-Methyluracil615-77-039 % similar 6-Amino-1-methyluracil2434-53-936 % similar Proxyphylline603-00-935 % similar 1,3-Dipropyl-7-methylxanthine31542-63-934 % similar Etofylline519-37-933 % similar Acefylline652-37-932 % similar 1-Methyl-1H-imidazole-4,5-dicarboxylic acid19485-38-232 % similar N1-Methylpseudouridine13860-38-332 % similar 2,6-Dichloro-7-methyl-7H-purine2273-93-031 % similar 1-Methylxanthine6136-37-431 % similar Diprophylline479-18-530 % similar