 | C4X-172818 | 1185878-98-1 | Stable isotopes | |
| Pentoxifylline-d6 |
 | C4X-172822 | 1185995-73-6 | Stable isotopes | |
| Hydroxy Pentoxifylline-d6 (rac-Lisofyllined6) |
 | C4X-17301 | 155593-75-2 | Stable isotopes | |
| Perphenazine-d4 |
 | C4X-173258 | NA | Stable isotopes | |
| Piperacillin-d5 (N-ethyl-d5) |
| C4X-17463 | 392711-19-2 | Stable isotopes | |
| Rapamycin-d3 (Sirolimus-d3) |
| C4X-176435 | NA | Stable isotopes | |
| Tiotropium Bromide EP Impurity G-d3 |
| C4X-176436 | NA | Stable isotopes | |
| Tiotropium EP Impurity G(Iodide) D3 |
 | C4X-17761 | 1174683-49-8 | Stable isotopes | |
| Vandetanib-d6 |
 | C4X-177918 | 113892-08-3 | Stable isotopes | |
| ?-Tocopherol-d6 |
 | C4X-177938 | 1354064-87-1 | Stable isotopes | |
| Ascorbic acid 13C6 |
