BI-409306 (S0039-GRP)

BI 409306 (SUB 166499) is a potent and selective inhibitor of human and rat PDE9A with mean IC50 of 65 nM and 168 nM, respectively. Treatment with BI 409306 increases brain cGMP levels, promotes long-term potentiation, and improves episodic and working memory performance in rodents.