申请人:Byk Gulden Lomberg Chemische Fabrik GmbH
公开号:US06121274A1
公开(公告)日:2000-09-19
The invention concerns componuds of formula (I), in which R1, R2, R3 and R4 have the meanings given in the description. The compounds are novel, effective PDE-inhibitors.
这项发明涉及式(I)的化合物,其中R1、R2、R3和R4具有描述中给出的含义。这些化合物是新颖而有效的PDE抑制剂。