2,6-Dithio-8-(N-heptylthio)theophylline 6466-23-5 NSC97991 Theophylline, 2,6-dithio-8-heptylthio- Theophylline, 8-(heptylthio)dithio- Uric acid, 1,3-dimethyl-2,6-dithio-(8-heptylthio)-