Compounds represented by formula (I) wherein each of Y, X and R individually is H, OH, alkyl, alkoxy, aryl, halo, CF3 and NO2, provided that at least one of Y, X and R is other than H; and pharmaceutically acceptable salts thereof are provided. Compounds of the above formula are useful as analgesics for treating pain, as immunomodulators and for treating drug abuse.
公式(I)所代表的化合物中,Y、X和R中的每一个单独可以是H、OH、烷基、烷氧基、芳香基、卤素、
CF3和
NO2,但至少一个Y、X和R不是H;并提供其药物可接受的盐。上述公式的化合物可用作镇痛剂治疗疼痛、免疫调节剂以及治疗药物滥用。