| Ubrogepant Intermediate 3 | 1235305-63-1 | Ax-URG003 |
| Azelastine EP Impurity D | 53242-89-9; 53242-88-9 | Ax-IMP875 |
| Ubrogepant Intermediate 4 | 1260403-56-2 | Ax-URG004 |
| Azelastine EP Impurity E | 20526-97-0 | Ax-IMP876 |
| Leflunomide EP Impurity C | 61643-23-0 | Ax-IMP869 |
| Ubrogepant Intermediate 6 | 103292-59-7 | Ax-URG006 |
| Ubrogepant Intermediate 7 | 6226-25-1 | Ax-URG007 |
| Leflunomide BP Impurity B | 163451-81-8 | Ax-IMP868 |
| Ubrogepant Intermediate 8 | 1375794-69-6 | Ax-URG008 |
| Triacetly aloe-emodin Impurity A | 25395-11-3 | Ax-IMP867 |