| 摘要 |
A compound of the formula (I) wherein R<1> is hydroxyethyl, 1-hydroxy-1-methylethyl, hydrogen, halogen, nitro, or cyano, R<2> is chloro, cyano, or lower alkyl optionally substituted with halogen, and R<3> is lower alkylthio, lower alkylsulfinyl, or lower alkylsulfonyl, provided that when R<1> is hydrogen, halogen, nitro, or cyano, then R<2> is chloro, and a pharmaceutically acceptable salt thereof, processes for their preparation and pharmaceutical compositions. |
