in order to improve the antibacterial activity of ampicillin , new penicillin derivatives having a 1-aryltriazole-4-carboxamide group or a 5-arylisoxazole-3-carboxamide group at the alpha-position of benzylpenicillin or p-hydroxybenzylpenicillin were synthesized .
C0030842
penicillin
C0030827
benzylpenicillin