| abstract |
The present invention provides a novel drug (for example, a pain medicine) having improved characteristics. A compound of formula (II) Wherein R 7 is substituted by one C3-C8 cycloalkyl group other than branched C6-C10 alkyl or cyclohexylmethyl other than 4-methylpent-1-yl and 1-methylpent-1-yl. C1-C6 alkyl, etc., where R 8 is methyl etc. optionally substituted by one or more fluoro groups), and those containing this compound are used. [Selection figure] None |