Theophylline Anhydrous 99% Extrapure is a high-purity (≥99%) anhydrous form of theophylline ((C7H8N4O2), acting as a white crystalline, odorless powder used primarily as an active pharmaceutical ingredient (API), in laboratory research, and for pharmaceutical formulations. It is a methylxanthine derivative used to treat respiratory diseases like asthma. In this “anhydrous” state, the compound contains no water of crystallization, making it highly concentrated and suitable for precise analytical and research applications.