Flucytosine for system suitability

Lufenuron for peak identification

Trimebutine for system suitability

Enrofloxacin

Levetiracetam impurity D - (2R)-2-(2-oxopyrrolidin-1-yl)butanamide ((R)-etiracetam)

Levetiracetam impurity C - pyridin-2-ol

Levetiracetam impurity B - (2Z)-2-(2-oxopyrrolidin-1-yl)but-2-enamide

Levetiracetam impurity A - (2RS)-2-(2-oxopyrrolidin-1-yl)butanoic acid

Levetiracetam

Meropenem trihydrate