Indacaterol Maleate is a selective _2-adrenergic agonist. Its chemical name is (R)-5-[2-(5,6-Diethylindan-2-ylamino)-1-hydroxyethyl]-8 hydroxy-1H-quinolin-2-one maleate. Indacaterol Maleate has a molecular weight of 508.56 and its empirical formula is C24H28N2O3.C4H4O4. Indacaterol Maleate is a white to very slightly grayish or very slightly yellowish powder. Indacaterol Maleate is freely soluble in N methylpyrrolidone and dimethylformamide, slightly soluble in methanol, ethanol, propylene glycol and polyethylene glycol 400, very slightly soluble in water, isopropyl alcohol and practically insoluble in 0.9% sodium chloride in water, ethyl acetate and n-octanol. Glycopyrronium is a long-acting, specific antimuscarinic agent, in clinical medicine often called an anticholinergic. It has a similar affinity to the subtypes of muscarinic receptors M1 to M5. In the airways, inhibition of M3-receptors at the smooth muscle results in relaxation. The high potency and slow receptor dissociation found its clinical correlate in significant and long-acting bronchodilation in patients with COPD.