| 摘要 |
Piperazine compounds useful as analgesics, and having the formula: <IMAGE> wherein each of R1 and R2 is hydrogen, halogen, C1-4 alkyl, C1-4 alkoxy or CF3; R3 is hydrogen, hydroxyl, an optionally substituted phenyl (e.g. phenyl, halo-phenyl, C1-4 alkyl-phenyl, C1-4 alkoxy-phenyl or CF3-phenyl), pyridyl, 2-thienyl or 2-pyrimidinyl; m is 2 or 3; and n is 0, 1 or 2, and pharmaceutically acceptable acid addition salts thereof are disclosed. |
