2-Thio-8-ethylthiotheophylline 4989-72-4 BRN 1126190 NSC 95863 Theophylline, (8-ethylthio)-2-thio- Theophylline, 8-ethylthio-2-thio- Uric acid, 1,3-dimethyl-8-ethylthio-2-thio-