Metoprolol

Metoprolol tartrate is the dibasic tartaric acid salt of the selective beta-1 adrenergic antagonist metoprolol. Its structure features a cyclopropylmethyl substituent at the 1-position of the propanolamine backbone, with methoxy groups at C-4 and the phenoxy aromatic ring. The tartrate salt forms via protonation of the terminal amine, enhancing water solubility. This compound serves as an HPLC reference standard for quantification of metoprolol derivatives in pharmaceutical formulations.