The present invention provides a compound of Formula I: wherein R1 is methyl, ethyl or cyclopropyl; R2 is hydrogen, methyl, or ethyl; R3 is methyl or AA; and R4 is C2-C4 alkyl, BB; or a pharmaceutically acceptable salt thereof; for use as a PDE1 inhibitor.
本发明提供了一种化合物,其
化学式为I:其中R1为甲基、乙基或环丙基;R2为氢、甲基或乙基;R3为甲基或
AA;R4为C2-C4烷基、BB;或其药用可接受盐,用作PDE1
抑制剂。