Reference Standard
| CAS Number | 131266-11-0 |
| Formula | C₁₅H₂₁N₅O₅ |
| Molecular Weight | 351.36 g/mol |
| Purity | ≥ 95.0% (HPLC) |
| Storage | Store at 2–8 °C |
Famciclovir Impurity 11 is a methoxy-substituted analog formed during the synthetic process. It is typically generated due to side-chain modification during esterification or alkylation steps.
Used as an impurity reference standard for method development, validation, and routine quality control of famciclovir drug substance and drug product.
Characterized by HPLC purity, LC-MS molecular confirmation, ¹H/¹³C-NMR, and IR spectroscopy.
