Noun
cloxacillin (countable and uncountable, plural cloxacillins)
(pharmacology) A semisynthetic antibiotic C19H18ClN3O5S in the same class as penicillin, effective especially against staphylococci which secrete beta-lactamase.
The penam core has a molecular weight of 243 g/mol, with larger penicillins having molecular weights near 450—for example, cloxacillin has a molecular weight of 436 g/mol. Source: Internet
These enzymes are able to inactivate the oxazolylpenicillins like oxacillin, cloxacillin, dicloxacillin. Source: Internet