6-Thio-8-(4'-pyridylmethyl)thiotheophylline 6493-45-4 BRN 1156560 NSC 98000 Theophylline, 8-(4-pyridylmethyl)thio-6-thio- Uric acid, 1,3-dimethyl-8-(4-pyridylmethyl)thio-6-thio-