| Human | PDE4D | 1mkd | J | | 6-(4-DIFLUOROMETHOXY-3-METHOXY-PHENYL)-2H-PYRIDAZIN-3-ONE | | |
| Human | PDE4D | 1mkd | K | | 6-(4-DIFLUOROMETHOXY-3-METHOXY-PHENYL)-2H-PYRIDAZIN-3-ONE | | |
| Human | PDE4D | 1mkd | L | | 6-(4-DIFLUOROMETHOXY-3-METHOXY-PHENYL)-2H-PYRIDAZIN-3-ONE | | |
| Human | PDE4D | 1oyn | A | A | ROLIPRAM | | |
| Human | PDE4D | 1oyn | A | B | ROLIPRAM | | |
| Human | PDE4D | 1oyn | B | A | ROLIPRAM | | |
| Human | PDE4D | 1oyn | B | B | ROLIPRAM | | |
| Human | PDE4D | 1oyn | C | A | ROLIPRAM | | |
| Human | PDE4D | 1oyn | C | B | ROLIPRAM | | |
| Human | PDE4D | 1oyn | D | A | ROLIPRAM | | |
| Human | PDE4D | 1oyn | D | B | ROLIPRAM | | |
| Human | PDE4D | 1ptw | A | | ADENOSINEMONOPHOSPHATE | | |
| Human | PDE4D | 1ptw | B | | ADENOSINEMONOPHOSPHATE | | |
| Human | PDE4D | 1ptw | C | | ADENOSINEMONOPHOSPHATE | | |
| Human | PDE4D | 1ptw | D | | ADENOSINEMONOPHOSPHATE | | |
| Human | PDE4D | 1q9m | A | | ROLIPRAM | | |
| Human | PDE4D | 1q9m | B | | ROLIPRAM | | |
| Human | PDE4D | 1q9m | C | | ROLIPRAM | | |
| Human | PDE4D | 1q9m | D | | ROLIPRAM | | |
| Human | PDE4D | 1tb7 | A | A | ADENOSINEMONOPHOSPHATE | | |
| Human | PDE4D | 1tb7 | A | B | ADENOSINEMONOPHOSPHATE | | |
| Human | PDE4D | 1tb7 | B | A | ADENOSINEMONOPHOSPHATE | | |
| Human | PDE4D | 1tb7 | B | B | ADENOSINEMONOPHOSPHATE | | |
| Human | PDE4D | 1tbb | A | A | ROLIPRAM | | |
| Human | PDE4D | 1tbb | A | B | ROLIPRAM | | |
| Human | PDE4D | 1tbb | A | C | | | |
| Human | PDE4D | 1tbb | B | A | ROLIPRAM | | |
| Human | PDE4D | 1tbb | B | B | ROLIPRAM | | |
| Human | PDE4D | 1tbb | B | C | | | |
| Human | PDE4D | 1xom | A | A | CILOMILAST | | |