4JIB:
reference: Discovery of potent, selective, bioavailable phosphodiesterase 2 (PDE2) inhibitors active in an osteoarthritis pain model, Part I: Transformation of selective pyrazolodiazepinone phosphodiesterase 4 (PDE4) inhibitors into selective PDE2 inhibitors., Plummer MS, Cornicelli J, Roark H, Skalitzky DJ, Stankovic CJ, Bove S, Pandit J, Goodman A, Hicks J, Shahripour A, Beidler D, Lu XK, Sanchez B, Whitehead C, Sarver R, Braden T, Gowan R, Shen XQ, Welch K, Ogden A, Sadagopan N, Baum H, Miller H, Banotai C, Spessard C, Lightle S, Bioorg Med Chem Lett. 2013 Mar 28. pii: S0960-894X(13)00400-9. doi:, 10.1016/j.bmcl.2013.03.072. PMID: 23582272

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