Oxtriphylline (CAS: 4499-40-5), also known as choline theophyllinate, is the choline salt of theophylline, a xanthine derivative. This specialty chemical is primarily utilized as a bronchodilator in pharmaceutical research, development, and manufacturing for treating respiratory conditions such as asthma, chronic bronchitis, emphysema, and chronic obstructive pulmonary disease (COPD). It functions by relaxing smooth muscles in the airways to improve breathing. Available as a high-purity (≥98%) white to off-white solid or powder, confirmed by IR, NMR, and purity analysis. For laboratory and industrial use; not for direct therapeutic administration.