| 摘要 |
Compounds of the formula (I), or pharmaceutically acceptable salts thereof <IMAGE> (I) wherein X is phenyl, optionally substituted by one halogen, C1-4 alkyl or C1-4 alkoxy; or pyridyl; R1 is hydrogen or C1-6 alkyl; and n is 1 to 6, pharmaceutical compositions containing them and a process for their preparation. These compounds are useful in the prophylaxis or treatment of diseases due to a histamine-mediated allergic response. |
