| abstract |
A pharmaceutical composition comprising as active ingredient a compound of formula (I), or a pharmacologically acceptable salt thereof: (see formula (I)) wherein R1 is for example a C6-C10 aryl group that may be substituted with one or more groups selected from the substituent group (; R2 is for example a C6-C10 aryl group which may be substituted with one or more groups selected from the substituent group (; and X is for example a hydroxyl group or an alkoxy group of C6-C10. |