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Classification of opioids by synthetic process.
| Naturally occurring compounds | Semi-synthetic compounds | Synthetic compounds |
|---|---|---|
| Morphine | Diamorphine (heroin) | Pethidine |
| Codeine | Dihydromorphone | Fentanyl |
| Thebaine | Buprenorphine | Methadone |
| Papaverine | Oxycodone | Alfentanil |
| Remifentanil | ||
| Tapentadol |
