| Similarity | Rank | |
|---|---|---|
| guanosine | 0.953 | 98672 |
| phosphodiesterase | 0.859 | 53286 |
| adenosine | 0.846 | 62814 |
| PDE5 | 0.839 | 36875 |
| arginine | 0.829 | 50005 |
| monoamine | 0.826 | 84399 |
| cGMP | 0.822 | 42119 |
| inhibitor | 0.818 | 17578 |
| PDE-5 | 0.817 | 59128 |
| synthase | 0.816 | 79262 |
| nitric | 0.815 | 25998 |
| inhibitors | 0.815 | 13701 |
| L-arginine | 0.814 | 67070 |
| reductase | 0.814 | 64818 |
| acetylcholine | 0.808 | 55829 |
| dapoxetine | 0.808 | 38111 |
| vasodilation | 0.803 | 78390 |
| vasodilator | 0.797 | 91177 |
| citrate | 0.797 | 18873 |
| oxidase | 0.795 | 61161 |
| cavernosum | 0.794 | 79648 |
| prostaglandin | 0.792 | 68337 |
| enzyme | 0.789 | 11596 |
| Sildenafil | 0.789 | 23972 |
| phenylalanine | 0.786 | 81370 |