The present invention provides a compound of the Formula II: wherein A is: R1 is CH3, CF3, or F; R2 is H, CH3, or F; R3 is CH3, OCH3, OH, F; R4 is OH or CH2OH; and X is CH or N; or a pharmaceutically acceptable salt thereof.本發明提供式II化合物:其中A係:R1係CH3、CF3或F;R2係H、CH3或F;R3係CH3、OCH3、OH、F;R4係OH或CH2OH;且X係CH或N;或其醫藥上可接受之鹽。