Cista.net

Replacement of a part of the antibiotic molecule can be accomplished chemically or enzymatically. In this way, semisynthetic penicillins, cephalosporins, tetracyclines, etc. were prepared. The production of semisynthetic penicillins and cephalosporins was facilitated by the fact that 6-amino penicillanic and 7-amino cephalosporanic acids (Fig ... ................
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