| abstract |
This invention relates to a method for preventing and/or treating bone diseases which comprises administering a potentiator of TGF-beta activity such as the compound of the formula [I] or pharmaceutically acceptable salts thereof to human being or animals. n nwherein n R 1 is hydrogen, etc., R 2 is optionally substituted ar(lower)alkyl or optionally substituted heterocyclic(lower)alkyl, etc., R 3 is hydrogen, optionally substituted hydroxy, etc., R 4 is hydrogen or lower alkyl, and X is CH or N. |