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具有下列结构(Ⅰ),且R为环状胺,如六氢吡啶,1.4-氧氮六圜或△~3-四氢吡啶时均具有较强的镇痛作用。作者对二十一个4-乙氧
Has the following structure (I), and R is a cyclic amine such as piperidine, 1.4-oxynitride or △ ~ 3-tetrahydropyridine have a strong analgesic effect. The author of twenty-one 4-ethoxy