Explanatory notes
… or by biosynthesis (e.g., penicillins from selected amino-acids); Natural antibiotics reproduced by synthesis … (INN). (5) Macrolides , e.g., erythromycin*, amphotericin B, tylosin. (6) Polypeptides , e.g., … antibiotic compounds whose molecules contain the penin or 6-aminopenicillanic acid skeleton of a ß-lactam of …