 | C4X-103110 | 150026-75-8 | Impurity | |
| Montelukast Impurity 10 |
 | C4X-103112 | 807638-71-7 | Impurity | |
| Montelukast Impurity 12 |
 | C4X-103113 | 918972-54-0 | Impurity | |
| Montelukast EP Impurity B |
 | C4X-103114 | 1187586-61-3 | Impurity | |
| Montelukast EP Impurity D |
 | C4X-103115 | 1187586-58-8 | Impurity | |
| Montelukast EP Impurity E |
 | C4X-103117 | 851755-56-1 | Impurity | |
| Montelukast EP Impurity H |
| C4X-103118 | 2045402-27-3 | Impurity | |
| Montelukast EP Impurity I |
 | C4X-103119 | 1258428-71-5 | Impurity | |
| Montelukast Impurity 19 |
| C4X-10312 | N/A | Impurity | |
| Montelukast Impurity 2 |
 | C4X-103121 | 142147-67-9 | Impurity | |
| Montelukast Impurity 21 |
