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| Compound |
| 1-methyl-4-piperidinol | 12.6 | |
| Levallorphan | 11.6 | |
| DuP 697 | 10.6 | |
| D-Histidine | 10.3 | |
| Gelsemine | 10.2 | |
| Butorphanol | 10.2 | |
| Thebaine | 9.7 | |
| D-Phenylalanine | 9.5 | |
| Nalorphine | 9.3 | |
| Mequitazine | 9.0 | |
| Mequitazine | 9.0 | |
| Mequitazine | 9.0 | |
| Mequitazine | 9.0 | |
| 4-piperidinol | 8.9 | |
| Hydromorphone | 8.8 | |
| SR 141716 | 8.8 | |
| C6H8O4 | 8.7 | |
| delta8-THC | 8.7 | |
| Ethylketocyclazocine | 8.6 | |
| Veronal | 8.6 | |
| Buprenorphine | 8.6 | |
| Cyclazocine | 8.6 | |
| Hydrocodone | 8.6 | |
| decahydroisoquinoline | 8.5 | |
| Morphine | 8.5 | |
| Levorphanol | 8.5 | |
| Propoxyphene | 8.4 | |
| Naloxone | 8.4 | |
| Bergenin | 8.3 | |
| Buspirone | 8.3 | |
| Benzoylecgonine | 8.1 | |
| A101 | 8.1 | |
| X 13 | 8.0 | |
| Zolpidem | 8.0 | |
| Aniracetam | 8.0 | |
| Hexobarbital | 7.9 | |
| Nalbuphine | 7.9 | |
| 4-phenylpiperidine | 7.9 | |
| Flumazenil | 7.9 | |
| Tizanidine | 7.7 | |
| Barbiturate | 7.7 | |
| Oleamide | 7.7 | |
| Prone | 7.6 | |
| Pargyline | 7.6 | |
| Morphine sulfate | 7.6 | |
| 202-791 | 7.5 | |
| Doxepin | 7.5 | |
| Cytisine | 7.5 | |
| BDH | 7.5 | |
| Alprazolam | 7.5 | |
| Heroin | 7.5 | |
| DHM | 7.4 | |
| Endomorphin-1 | 7.4 | |
| Naltrexone | 7.4 | |
| EEDQ | 7.4 | |
| Guanabenz | 7.3 | |
| Temazepam | 7.3 | |
| Oxycodone | 7.2 | |
| Agmatine | 7.2 | |
| Risperidone | 7.1 | |
| Tramadol | 7.1 | |
| Metiamide | 7.1 | |
| Tranylcypromine | 7.1 | |
| Hexobarbital | 7.0 | |
| Sinomenine | 7.0 | |
| Caryophyllene | 7.0 | |
| 2,4-dichlorophenyl | 7.0 | |
| 2,4-dichlorophenyl | 7.0 | |
| Methadone | 6.9 | |
| Oxazepam | 6.8 | |
| Sufentanil | 6.8 | |
| NOP | 6.6 | |
| Nitrazepam | 6.5 | |
| Sibutramine | 6.5 | |
| Pentazocine | 6.5 | |
| Phosphoramidon | 6.5 | |
| Nitrendipine | 6.4 | |
| TIF | 6.4 | |
| Alfentanil | 6.4 | |
| DAMGO | 6.4 | |
| 1,1,2-trichloroethane | 6.4 | |
| Midazolam | 6.3 | |
| cyclohexanecarboxamide | 6.3 | |
| Pentazocine | 6.3 | |
| 1H-pyrazole | 6.2 | |
| Paroxetine | 6.2 | |
| Saccharin | 6.2 | |
| Ketorolac | 6.2 | |
| Allopregnanolone | 6.2 | |
| 2-methylpiperazine | 6.2 | |
| ecgonine methyl ester | 6.2 | |
| Ephedrine | 6.2 | |
| Chloral hydrate | 6.1 | |
| DLG | 6.1 | |
| Pentobarbital | 6.1 | |
| 2-pyrrolidinone | 6.1 | |
| GYKI 52466 | 6.1 | |
| Allopregnanolone | 6.0 | |
| Glycine, | 6.0 | |
| 1H-pyrazole | 6.0 | |
| Mecamylamine | 6.0 | |
| Loperamide | 6.0 | |
| Spiperone | 6.0 | |
| Honokiol | 5.9 | |
| 2-butenyl | 5.9 | |
| Mepyramine | 5.9 | |
| D-Ala | 5.9 | |
| Chlordiazepoxide | 5.9 | |
| 2-butenyl | 5.8 | |
| gamma-hydroxybutyric acid | 5.8 | |
| 6-Hydroxydopamine | 5.8 | |
| Pimozide | 5.8 | |
| Codeine | 5.8 | |
| PNU | 5.8 | |
| Remifentanil | 5.8 | |
| 1,1,1-trichloroethane | 5.7 | |
| R 2 | 5.7 | |
| Glycine, | 5.6 | |
| Pindolol | 5.6 | |
| EAA | 5.6 | |
| CNA | 5.6 | |
| Sumatriptan | 5.6 | |
| THIP | 5.6 | |
| PCP | 5.6 | |
| Baclofen | 5.6 | |
| AEA | 5.5 | |
| MK801 | 5.5 | |
| pyridazine | 5.5 | |
| pyridazine | 5.5 | |
| Lorazepam | 5.5 | |
| Corticotropin | 5.5 | |
| ethanol | 5.5 | |
| d-Amphetamine | 5.5 | |
| AEA | 5.5 | |
| 2-pyrrolidinone | 5.4 | |
| Venlafaxine | 5.4 | |
| Ceftriaxone | 5.4 | |
| Papaverine | 5.4 | |
| TBS | 5.3 | |
| Pentobarbital | 5.3 | |
| MOP | 5.3 | |
| VMA | 5.2 | |
| Dynorphin | 5.2 | |
| 4-chlorophenyl | 5.1 | |
| 4-chlorophenyl | 5.1 | |
| Bupropion | 5.1 | |
| Nicotine | 5.1 | |
| Diazepam | 5.0 | |
| ECS | 5.0 | |
| 1,2,3,4-tetrahydroisoquinoline | 5.0 | |
| DBA | 5.0 | |
| cyclopentyl | 5.0 | |
| DBA | 5.0 | |
| dipropyl | 5.0 | |
| MHPG | 4.9 | |
| Nordihydroguaiaretic acid | 4.9 | |
| CPA | 4.8 | |
| cinnamyl | 4.8 | |
| GABA | 4.8 | |
| GABA | 4.8 | |
more... |