Novel raw material compounds are provided that are useful for producing novel cycloalkane carboxamide derivatives having cathepsin K inhibitory action.An oxazolone derivative represented by formula (I): [wherein, R1 represents a substituted or unsubstituted alkyl group, substituted or unsubstituted alkenyl group, substituted or unsubstituted alkynyl group, substituted phenyl group, substituted or unsubstituted naphthyl group or substituted or unsubstituted heterocyclic group, and ring A represents a saturated cyclic alkylidene group having 6 to 7 carbon atoms].