roflumilast copd drug molecule (pde4 inhibitor). atoms are represented as spheres with conventional color coding: hydrogen (white

roflumilast pde4 inflammation antiinflammatory lung asthma chronic obstructive phosphodiesterase pulmonary disease copd bronchitis immune hydrogen carbon oxygen nitrogen fluorine chlorine drug therapy medicine medicinal product pharmacology pharmacy pharmaceutical pharma treatment generic molecule atoms chemical chemistry composition atomic model molecular