The present invention provides a compound of Formula (I), wherein X is H or C1-C3 alkyl optionally substituted with hydroxyl; Y is H, hydroxy, or methyl; R is ethyl, n-propyl, cyclopropyl, or Formula (II); and A is methyl, cyclopropyl or trifluoromethyl; or a pharmaceutically acceptable salt thereof; with the proviso that when X and Y are both H and R is n-propyl, then A is other than methyl; for use as a human PDE1 inhibitor.
本发明提供了式 (I) 的化合物,其中 X 是 H 或任选被羟基取代的 C1-C3 烷基;Y 是 H、羟基或甲基;R 是乙基、正丙基、环丙基或式 (II);A 是甲基、环丙基或三
氟甲基;或其药学上可接受的盐;但当 X 和 Y 都是 H 且 R 是正丙基时,则 A 不是甲基;用作人 PDE1
抑制剂。