| 摘要 |
The present invention relates to novel xanthene and thioxanthene derivatives of the following general formula: <IMAGE> I wherein Y represents sulfur or oxygen, R1 represents hydrogen, chlorine, trifluoromethyl or dimethylsulfamoyl, R2 represents hydrogen or fluorine; and R3 and R4 each represents hydrogen or methyl, provided that R3 and R4 may not both represent hydrogen, or R3 and R4 taken together with the nitrogen atom form a piperazine or piperidine ring optionally substituted in the 4-position by a methyl group or a 2-hydroxyethyl group, if desired, esterified with an aliphatic carboxylic acid having from one to seventeen carbon atoms inclusive, as well as non-toxic acid addition salts thereof.
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