The present invention provides a compound which enhances the production of erythropoietin. The present invention provides a compound represented by formula (1):[wherein, R1: formula (1A):[wherein, R4 and R5: H, halogen, or alkyl； R6: H, halogen, alkyl, or the like； R7: substitutable hydroxyalkyl, substitutable hydroxyhalo alkyl, substitutable alkoxyalkyl, or the like； substituent group α: oxo, hydroxy, amino, or the like； ring Q1: a monocyclic heterocyclic group； ring Q2: a monocyclic hydrocarbon ring group, or a monocyclic heterocyclic group； ring Q3: a monocyclic hydrocarbon ring group, or a monocyclic heterocyclic group； X: a single bond, methylene, ethylene, or the like]； R2: alkyl, or methylsulfanyl； and R3: H, or methyl], or the like.
