Cephamycins

**Definition:** Naturally occurring family of beta-lactam cephalosporin-type antibiotics having a 7-methoxy group and possessing marked resistance to the action of beta-lactamases from gram-positive and gram-negative organisms.

**Tree numbers:** - D02.065.589.099.249.250 - D02.886.665.074.250 - D03.633.100.300.249.250

**Synonyms:** - Cephamycin - Antibiotics, Cephamycin