| 1Codeine |
|---|
| 2Codeine-d6 |
| 3Hydrocodone |
| 4Hydromorphone |
| 5Hydromorphone-d6 |
| 6Meperidine |
| 7Meperidine-d4 |
| 8Morphine |
| 9Morphine-d3 |
| 10N-Desmethyltramadol |
| 11Normeperidine |
| 12Normeperidine-d4 |
| 13Normorphine |
| 14O-Desmethyltramadol |
| 15Oxycodone |
| 16Oxycodone-d6 |
| 17Oxymorphone |
| 18Tramadol |















