An analgesic composition containing as active ingredient a piperazine derivative represented by the general formula (1) ##STR1## wherein R.sub.1 represents a cyclopropylmethyl group, an isopropyl group or an allyl group and R.sub.2 represents a phenyl group having as substituent a halogen atom or a trifluoromethyl group.
一种止痛组合物,其活性成分为由通式(1)所表示的
哌嗪衍
生物,其中R.sub.1表示
环丙基甲基基团,异丙基基团或烯丙基基团,而R.sub.2表示具有卤原子或三
氟甲基基团取代基的苯基团。