The present invention provides a compound which enhances the production of erythropoietin. The present invention provides a compound represented by the formula (1) wherein R1: an aromatic hydrocarbon ring group or an aromatic heterocyclic group; R2: a hydrogen atom, an alkyl group, or a heterocycloalkyl group; R3: a hydrogen atom or an alkyl group; A: a hydrogen atom or a hydroxy group; L: -NHCO- or -OCH2-; and X: a nitrogen atom or =CH-.
本发明提供了一种能增强促红细胞生成素生成的化合物。 本发明提供了一种由式(1)表示的化合物 其中 R1:
芳香烃环基或芳香杂环基;R2:氢原子、烷基或杂环基;R3:氢原子或烷基;A:氢原子或羟基;L:-NHCO- 或 -OCH2-;以及 X:氮原子或 =CH-。