 | C4X-189919 | 4152-09-4 | Impurity | |
| Benzylpenicillin Impurity 19 |
 | C4X-189921 | 13057-98-2 | Impurity | |
| Benzylpenicillin Impurity 21(Mixture of Diastereomers) |
 | C4X-189927 | N/A | Impurity | |
| Benzylpenicillin Impurity 27 |
| C4X-189928 | 4052-54-4 | Impurity | |
| Benzylpenicillin Impurity 28 |
| C4X-189936 | 87-53-6 | Impurity | |
| Penicillanic Acid |
| C4X-189937 | 4027-63-8 | Impurity | |
| Penicillanic Acid Potassium |
 | C4X-18994 | 13093-87-3 | Impurity | |
| Benzylpenicillin EP Impurity D |
| C4X-189941 | N/A | Impurity | |
| Penicillin Impurity 41 |
| C4X-189943 | N/A | Impurity | |
| Penicillin Impurity 43 |
| C4X-18995 | N/A | Impurity | |
| Benzylpenicillin EP Impurity E |
