 | C4X-210210 | NA | Stable isotopes | |
| Favipiravir-13C3 |
 | C4X-21049 | 1354560-58-9 | Stable isotopes | |
| Pyridoxal 5'-Phosphate-d3 |
 | C4X-21052 | 53866-34-5 | Stable isotopes | |
| Estrone-d4 (Estriol EP Impurity B-d4) |
| C4X-21053 | NA | Stable isotopes | |
| Estrone 3-Sulfate-d5 Sodium Salt |
 | C4X-21054 | 285979-80-8 | Stable isotopes | |
| Estrone-d4 3-Sulfate Sodium Salt |
| C4X-2108109 | NA | Stable isotopes | |
| Baloxavir-d5 |
| C4X-21214 | 1206185-52-5 | Stable isotopes | |
| Levulinic-d5 Acid |
 | C4X-21225 | 2033106-92-0 | Stable isotopes | |
| Mycophenolic Acid-d3 |
| C4X-21226 | NA | Stable isotopes | |
| Mycophenolic Acid-13C-d3 |
| C4X-21227 | NA | Stable isotopes | |
| Mycophenolic Acid-d3 ?-D-Glucuronide |
