| 摘要 |
A compound is disclosed of the formula (I): <IMAGE> (I) wherein R1 represents a hydrogen atom, or a carboxy, alkoxycarbonyl, piperidinocarbonyl, 1-pyrrolidinylcarbonyl, morpholinocarbonyl, carbamoyl or benzylcarbamoyl group, or an alkylcarbamoyl or dialkylcarbamoyl group in which the, or each, alkyl group has from 1 to 4 carbon atoms; R2 represents a hydrogen or fluorine atom, or a cyano, acetyl or carbamoyl group; and R3 represents a hydrogen atom or a methyl group; and represents a single or a double bond, with the proviso that R1 and R2 do not simultaneously represent hydrogen atoms; or a pharmaceutically acceptable salt thereof.
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