| Chemical Structure | CAT No. | CAS | Item Group | Purity |
|---|---|---|---|---|
 | C4X-106937 | N/A | Impurity | |
| ErlotiniB impurity 37 | ||||
 | C4X-106938 | 574738-66-2 | Impurity | |
| Erlotinib Impurity 38 | ||||
| C4X-106939 | N/A | Impurity | |
| Erlotinib Impurity 39 | ||||
| C4X-10694 | N/A | Impurity | |
| Erlotinib Impurity 4 | ||||
 | C4X-106940 | 591-19-5 | Impurity | |
| Erlotinib Impurity 40 | ||||
| C4X-106941 | 69088-96-6 | Impurity | |
| Erlotinib Impurity 41 | ||||
| C4X-106942 | 501684-22-6 | Impurity | |
| Erlotinib Impurity 42 | ||||
 | C4X-106944 | 1170354-84-3 | Impurity | |
| Desmethyl Erlotinib Carboxylate Acid | ||||
| C4X-106946 | N/A | Impurity | |
| Erlotinib Impurity 46 | ||||
| C4X-106947 | 179688-26-7 | Impurity | |
| Erlotinib Impurity 47 | ||||
