(S)-PF-04449613 from MedChemExpress

(S)-PF-04449613 is the left-handed isomer of PF-04449613 (HY-12788). PF-04449613 is a selective PDE9A inhibitor with an IC50 of 22 nM. PF-04449613 improves motor learning ability in a mouse model[1][2]