3d image of theophylline skeletal formula

theophylline dimethylxanthine phosphodiesterase respiratory diseases chronic obstructive pulmonary disease copd asthma xanthine theobromine caffeine alkaloid tea camellia sinensis cocoa theobroma cacao liver smooth muscle bronchial heart muscle contractility positive inotrope rate chronotropic blood pressure renal flow anti-inflammatory central nervous system center infant apnea anosmia herbal phytochemical phytotherapy plant herb natural herbalism pharmacognosy pharmacopoeia alternative medicine herbal phosphodiesterase inhibitor molecule molecular formula skeletal structural structure 3d biochemical