| abstract |
The invention discloses a pharmaceutical composition comprising a compound having formula (I) or a pharmacologically acceptable salt thereof as an active ingredient, wherein, R<1> is, for example, a C6-C10 aryl group which may be substituted with one group or more than one group selected from substituent group alpha; R<2> is, for example, a C6-C10 aryl group which may be substituted with one group or more than one group selected from substituent group alpha; and X is, for example, a hydroxyl group or a C1-C6 alkoxy group. |