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2,5-Pyrazinediethanol Clavulanic Impurity A Clavulanic acid Impurity A Clavulanate Potassium EP Imp A 2,5-Pyrazinediethanol impurity 2,5-Bis(2-hydroxyethyl)pyrazine 2,2'-(2,5-Pyrazinediyl)diethanol Potassium Clavulanate impurity A 2,2'-(pyrazine-2,5-diyl)diethanol Potassium Clavulanate EP Impurity A Clavulanate Potassium EP Impurity A Clavulanate Potassium Impurity 1(Clavulanate Potassium EP Impurity A) Clavulanate Potassium impurity 1/Potassium Clavulanate EP Impurity A/2,5-Pyrazinediethanol