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Procaterol hydrochloride occurs as white to pale yellow-white crystals or crystalline powder. It is soluble in water, formic acid and methanol, slightly soluble in ethanol (95) and practically insoluble in diethyl ether. The pH of its aqueous solution (1-100) is 4-5. It gradually changes in color when exposed to light. Its aqueous solution (1-20) shows no optical rotation.
Procaterol hydrochloride is 8-Hydroxy-5-[(1RS,2RS)-1-hydroxy-2-isopopylamino-butyl]-quinolin-2(1H)-one monohydrochloride hemihydrate. Its molecular formula is C16H22N2O3·HCl·½H2O and has a molecular weight of 335.83. Melting point: Approximately 195°C (decomposition).
