A compound of formula I,
wherein A, Ra, Rb, R1 to R5, m and t are as defined as disclosed, or a pharmaceutically acceptable salt or ester thereof, useful as an alpha-2 antagonist. The compounds I can be used for the treatment of diseases or conditions where alpha-2 antagonists are indicated to be effective.
化合物I的
化学式为:其中A、Ra、Rb、R1至R5、m和t如所披露的那样定义,或其药学上可接受的盐或酯,可用作α-2拮抗剂。化合物I可用于治疗需要α-2拮抗剂有效的疾病或病况。