Letermovir impurities are primarily used as reference standards and analytical standards in pharmaceutical research and quality-control laboratories. They are used to identify characterize and quantify impurities and degradation products associated with Letermovir in drug substances and drug products.

The purpose of Letermovir impurity standards is to support impurity profiling analytical method development and validation stability studies and quality assessment of Letermovir.

Letermovir impurities are chemically related substances or degradation products that may be present in Letermovir during its synthesis manufacturing storage or handling.