| 摘要 |
The invention provides a compound of formula (I) wherein R1 denotes hydrogen, methyl or phenyl; R2, R3, R4 and R5 denote hydrogen, halogen, preferably a chlorine atom, alkyl, preferably methyl, alkoxyl, preferably methoxyl; m denotes a number 0 or 1; and HX denotes sulfuric, phosphoric, acetic, malonic, fumaric, oxalic, lactic, tartaric, citric, gluconic, p-toluenesulfonic, methanesulfonic acid, hydrogen bromide or hydrogen iodide, preferably hydrogen chloride. The use of the compounds as a2-adrenergic receptor agonists is also provided. |
