Description: 4-Hydroxy propranolol-d7 HCl is a deuterated compound of 4-Hydroxy propranolol HCl. 4-Hydroxy propranolol HCl has a CAS number of 14133-90-5. 4-Hydroxypropranolol hydrochloride is an active metabolite of Propranolol, with a potency comparable to Propranolol. It inhibits β1- and β2-adrenergic receptors (pA2s: 8.24 and 8.26).