acrivastine molecule, molecular structures, h1-receptor antagonist antihistamine, 3d model, structural chemical formula and atoms

acrivastine h1receptor antagonist antihistamine upper respiratory combinations molecule molecular structure chemical formula model c22h24n2o2 atom illustration disease flu health care illness medication medicine oral prescription product seasonal treatment congestion sneeze tablets cold allergic rhinitis duact hay fever pollen allergy pseudo ephedrine agent bond carbon chemistry laboratory liquid oxygen ring science signs structures h1-receptor structural atoms color coding coding