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A.在6位酰胺侧链的α位引入极性亲水性基团,如-NH2、-COOH、-SO3H等 B.将3位的乙酰氧基以甲基、氯原子取代,增加药效和改变药代动力学性质 C.7位的酰胺侧链上引入噻吩环等杂环 D.将3位的乙酰基以含N的杂环取代,增加药效和改变药代动力学性质 E.在7位酰胺侧链的α位引入极性亲水性基团,如-NH2、-COOH、-SO3H等下列半合成抗生素类药物是由青霉素G或头孢 菌素C的结构改造而来,它们分别适合上述的哪一条 氨苄青霉素
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