6-Thio-8-[(3'-pyridylmethyl)thio]theophylline 6493-44-3 NSC97999 Theophylline, 8-[(3-pyridylmethyl)thio]-6-thio- Uric acid, 1,3-dimethyl-8-[(3-pyridylmethyl)thio]-6-thio-