Clarithromycin EP Impurity E, すなわち Clarithromycin Related Compound A は、クラリスロマイシンのエリスロマイシン由来14員環ラクトン骨格に関連する構造既知のマクロライド系不純物である。CAS 81103-14-2、分子式 C39H71NO13、分子量 761.98 g/mol に対応する。本化合物は、デソサミン含有マクロライド骨格の部分的生体内変換、アシル移動、または転位に由来する工程関連もしくは分解関連の関連物質とみなされることが多い。微量定量には、逆相LC-MS/MS、高分解能質量分析、ならびにダイオードアレイ検出を備えたHPLCによる分離が通常必要である。規制上は、構造帰属、相対応答係数、そして薬局方モノグラフに対する規格設定が重視される。
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