Colterol acetate (Standard) is the standard substance of Colterol acetate, and it is applicable for quantitative analysis, quality control, and related research in biochemical experiments. Colterol acetate is a selective β-adrenergic receptor inhibitor that relaxes tracheal smooth muscle primarily through β2 receptors, reduces subspastic contractions of tricholoma (acting on β2), and enhances the contractility of left ventricular papillary muscles by targeting β1 receptors .