| abstract |
A chondrogenesis promoter comprising as an active ingredient a compound represented by general formula (I) or a salt thereof: <CHEM> wherein R<1> represents a halogen atom, a lower alkyl group, a lower alkoxy group, etc.; R<2> represents a hydrogen atom, a lower alkyl group, a lower alkenyl group, a lower alkynyl group, a lower alkoxy group, an acyl group, an aryl group, a heterocyclic group, etc.; R<3> represents a lower alkyl group, a cycloalkyl group, an aryl group, a heterocyclic group, etc.; R<4> represents a hydrogen atom, a lower alkyl group, an aryl group, a heterocyclic group, etc.; X and Y represent -CH2-, -NH- or -O-; and n represents an integer of 0-4. |