Oxacephem
Encyclopedia
An oxacephem is a molecule similar to a cephem
Cephem
Cephems are a sub-group of beta-lactam antibiotics including cephalosporins and cephamycins....

, but with oxygen substituted for the sulfur. They are synthetically made compounds and have not been discovered in nature.

An example is moxalactam.

Another example is flomoxef
Flomoxef
Flomoxef is an oxacephem antibiotic.It has been identified as second-generation and fourth generation....

.
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