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特許 係属中 The cephalosporins (sg. /ˌsɛfəlɵˈspɔrɨn/) are a class of β-lactam antibiotics originally derived from the fungus Acremonium, which was previously known as "Cephalosporium".[1] Together with cephamycins, they constitute a subgroup of β-lactam antibiotics called cephems.