Theophylline, anhydrous, ≥99%, powder
Theophylline, Pharmaceutical Secondary Standard; Certified Reference Material
Theophylline, certified reference material, United States Pharmacopeia (USP) Reference Standard
Theophylline, European Pharmacopoeia (EP) Reference Standard
Theophylline, phyproof® Reference Substance
Theophylline, British Pharmacopoeia (BP) Reference Standard