Dihydroalprenolol
Dihydroalprenolol ( DHA ) is a hydrogenated alprenolol derivative that acts as a beta-adrenergic blocker . 
<triplet> Dihydroalprenolol <subj> beta-adrenergic blocker <obj> subject has role <triplet> alprenolol <subj> beta-adrenergic blocker <obj> subclass of