Studies on Ampicillin and Amoxicillin Derivatives. III. Synthesis of 6-[2-[(Pyrido[2, 3-d] pyrimidin-6-yl) methylamino]-2-phenylacetamido] penicillanic Acid Derivatives, 6-[2-(4-Pyrimidinylamino)-2-phenylacetamido] penicillanic Acid Derivatives and-cephalosporanic Acid Derivatives

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