| abstract |
(57) [Summary] Expression Wherein R 1 is a hydroxyethyl group, 1-hydroxy-1-methylethyl group, hydrogen, halogen, nitro group or cyano group, R 2 is a chloro group, a cyano group or a lower alkyl optionally substituted with a halogen. R 3 represents a lower alkylthio group, a lower alkylsulfinyl group or a lower alkylsulfonyl group, and when R 1 is hydrogen, halogen, nitro or cyano, R 2 represents a chloro group. Or a pharmaceutically acceptable salt thereof, a method for producing them, and a pharmaceutical composition comprising them. |