theophylline or 1,3-dimethylxanthine molecule. purine alkaloid, dimethylxanthine, xanthine derivative. vasodilator, asthmatic,

alkaloid antiinflammatory asthmatic atom atomic blue bronchodilator carbon chemical chemistry dark dimethylxanthine drawing drug flat formula hydrogen icon illustration methylxanthine molecular molecule muscle organic oxygen purine relaxant structural structure theophylline vasodilator vector white xanthine