Regorafenib EP Impurity A, すなわち Regorafenib Related Compound A は CAS 757251-39-1 により同定され、分子式 C13H12FN3O2、分子量 261.26 g/mol を有する。本化合物は、regorafenib に存在する置換フッ素化複素芳香族骨格の構築に関連した、定義された合成中間体または工程由来不純物を表す。この種の物質は、反応不完全、副反応、または前駆体の残留を示唆し得るため、不純物プロファイリングで通常監視される。定量には、高分解能 LC-MS、LC-MS/MS、不純物特異的 HPLC による UV 検出が一般に必要であり、必要に応じて NMR による構造確認が行われる。
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