On the proteinaceous impurity of penicillin.
D003956:Dialysis; D004340:Drug Contamination; D010400:Penicillin G / Q000032:analysis*; D011506:Proteins / Q000032:analysis*; D012964:Sodium / Q000032:analysis*
D011506:Proteins; D012964:Sodium; D010400:Penicillin G