cephalosporin P

ceph·a·lo·spo·rin P

a steroid antibiotic produced by Cephalosporium, chemically related to fusidic and helvolic acids, that is active only against Gram-positive bacteria.
References in periodicals archive ?
(1955-56) had isolated cephalosporin C, cephalosporin P and penicillin N from culture of C.