6-Thio-8-(2'-pyridylmethyl)thiotheophylline 6493-43-2 BRN 1156852 NSC 97997 Theophylline, 8-(2-pyridylmethyl)thio-6-thio- Uric acid, 1,3-dimethyl-8-(2-pyridylmethyl)thio-6-thio-