Levetiracetam Related Compound B は、L-2-Aminobutanamide または Levetiracetam EP Impurity G とも呼ばれる遊離塩基型のアミド性アミン不純物で、CAS 7324-11-0 に対応する。分子式 C4H10N2O、分子量 102.14 g/mol を有し、レベチラセタム製造における不完全な環化反応またはアミド化工程に由来する小分子で高極性の合成中間体、あるいは工程由来副生成物として位置づけられる。発色団を持たない塩基性不純物であるため、同定と定量には LC-MS/MS や誘導体化 GC-MS が一般的で、分離には HILIC やイオンペアクロマトグラフィーが併用される。薬局方および ICH の不純物管理文脈で重要である。
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