References
[1] Michel Gallant, et al. Discovery of MK-0952, a Selective PDE4 Inhibitor for the Treatment of Long-Term Memory Loss and Mild Cognitive Impairment. Epub 2010 Sep 21. DOI:
10.1016/j.bmcl.2010.09.087[2] Tingting Pan, et al. Dual Functional Cholinesterase and PDE4D Inhibitors for the Treatment of Alzheimer's Disease: Design, Synthesis and Evaluation of tacrine-pyrazolo[3,4-b]pyridine Hybrids. Behav Brain Res. 2016 Apr 15;303:26-33. DOI:
10.1016/j.bmcl.2019.06.056