Oxprenolol (hydrochloride) (Standard) is the analytical standard of Oxprenolol (hydrochloride). This product is intended for research and analytical applications. Oxprenolol hydrochloride (Ba 39089) is an orally bioavailable beta-adrenergic receptor (beta-AR) antagonist with a Ki of 7.10 nM in a radioligand binding assay using rat heart muscle[1].