| Index | Ligand Name | Structure | PDB code | Compound Potency nM |
| 1 | 4qj | Crystal structure of human PDE1B with inhibitor 3 | 5b25 | 0.058 |
| 2 | 8hm | Crystal structure of human PDE1B catalytic domain in complex with inhibitor 16j (6-(4-Methoxybenzyl)-9-((tetrahydro-2H-pyran-4-yl)methyl)-8,9,10,11-tetrahydropyrido[4',3':4,5]thieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidin-5(6H)-one) | 5uoy | 27 |
| 3 | 0nk | Crystal structure of human PDE1B bound to inhibitor 7A (6,7,8-trimethoxy-N-(pentan-3-yl)quinazolin-4-amine) | 4npv | 35 |
| 4 | 8hp | Crystal structure of human PDE1B catalytic domain in complex with inhibitor 3 (6-(4-chlorobenzyl)-8,9,10,11-tetrahydrobenzo[4,5]thieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidin-5(6H)-one) | 5up0 | 460 |