 | C4X-208514 | NA | Stable isotopes | |
| Nicergoline Impurity 14 D3 |
| C4X-208518 | NA | Stable isotopes | |
| Nicergoline Impurity 18 D4 |
| C4X-209513 | NA | Stable isotopes | |
| "1,5-Anhydro-D-glucitol-13C6" |
 | C4X-209610 | 1279033-05-4 | Stable isotopes | |
| Benazeprilat-d5 (Benazepril EP Impurity C-d5) |
 | C4X-20969 | 1279026-26-4 | Stable isotopes | |
| Benazepril-d5 HCl |
 | C4X-20983 | 1346112-79-5 | Stable isotopes | |
| Thromboxane B2-d4 |
| C4X-20992 | NA | Stable isotopes | |
| Tapentadol-d5 O-?-D-Glucuronide |
| C4X-20993 | 1346598-84-2 | Stable isotopes | |
| Tapentadol-d5 O-Sulfate |
| C4X-210043 | NA | Stable isotopes | |
| Remdesivir-d4 |
| C4X-210210 | NA | Stable isotopes | |
| Favipiravir-13C3 |
