| 1Morphine |
|---|
| 2Morphine-d3 |
| 3Oxymorphone |
| 4Hydromorphone |
| 5Hydromorphone-d6 |
| 6Codeine |
| 7Codeine-d6 |
| 8Naloxone |
| 9Oxycodone |
| 10Oxycodone-d6 |
| 11Naltrexone |
| 12Hydrocodone |
| 13cis-Tramadol |
| 14C13-D3-tramadol |
| 15Meperidine |
| 16Meperidine-d4 |
| 17Fentanyl |
| 18Buprenorphine |
| 19Buprenorphine-d4 |
| 20Methadone |
| 21Methadone-d3 |















