6A3N:
reference: Discovery of Potent, Selective, and Orally Bioavailable Inhibitors against Phosphodiesterase-9, a Novel Target for the Treatment of Vascular Dementia., Wu Y, Zhou Q, Zhang T, Li Z, Chen YP, Zhang P, Yu YF, Geng H, Tian YJ, Zhang C, Wang Y, Chen JW, Chen Y, Luo HB, J Med Chem. 2019 Apr 3. doi: 10.1021/acs.jmedchem.8b01041. PMID: 30916555

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).