;
基;The penem antibiotics are a series of unclassical β-lactam antibiotics including thio-substituted, carbon-substituted, heterocycle-substituted penems and the β-lactamase inhibitors.
青霉烯是一
非典型β-内酰
抗生素,能用于治疗由多种耐药菌引起的重症感染。
The penem antibiotics are a series of unclassical β-lactam antibiotics including thio-substituted, carbon-substituted, heterocycle-substituted penems and the β-lactamase inhibitors.
青霉烯是一非典型β-内酰抗生素,能用于治疗由多种耐药菌引起的重症感染。
These on reduction with NaBH4 gave exclusively cis-3-heterocycle substituted chroman-4-ols in good yields.
【
】3,3-Dibromochroman-4-ones on reaction with different heterocyclic secondary amines gave 3-substituted chromones.
明：以上例句、词性分
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