The present invention provides a compound which has the effect of PDE inhibition, and which is useful as a medicament for preventing or treating schizophrenia or so on. A compound of formula (I
0
), wherein R1 represents a substituent; R2 represents a hydrogen atom, or a substituent; R3 represents a hydrogen atom, or a substituent; Ring A represents an aromatic ring which can be substituted, and Ring B represents a 5-membered heteroaromatic ring which can be substituted, or a salt thereof.
本发明提供了一种具有PDE抑制作用的化合物,可用作预防或治疗精神分裂症等药物。化合物的式子为(I0),其中R1代表取代基;R2代表
氢原子或取代基;R3代表
氢原子或取代基;环A代表可取代的芳香环,环B代表可取代的五元杂环芳基环或其盐。