| 摘要 |
Antitussives containing as the active ingredient tricyclic compounds represented by the general formula (I) or pharmacologically acceptable salts thereof: (I) wherein R<1> is hydrogen, substituted or unsubstituted lower alkyl, or the like; X<1>-X<2>-X<3> is CR<5>=CR<6>-CR<7>=CR<8> (wherein R<5>, R<6>, R<7> and R<8> are each independently hydrogen, substituted or unsubstituted lower alkyl, or the like) or the like; Y is -CH2S- or the like; and R<2> is hydrogen, substituted or unsubstituted lower alkyl, or the like.
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