A method of effecting serotonin-2-receptor antagonism in a mammal in need thereof, which entails administering to the mammal an effective amount of a compound of the formula (I), or a pharmaceutically acceptable salt thereof:
1
wherein ring P, the dashed line, Z
1
, Z
2
, A and Y are as defined herein.
                            一种在需要的哺乳动物中实现5-羟
色胺2受体拮抗作用的方法,该方法包括向哺乳动物投与化合物(I)或其药学上可接受的盐的有效量:1其中,环P、虚线、Z1、Z2、A和Y的定义如本文所述。