n 1  :  a complex of antibiotic substances which is produced by a Japanese bacterium of the genus Streptomyces (S. caespitosus)  2  :  a component C₁₅H₁₈N₄O₅ of mitomycin that inhibits DNA synthesis and is used as an antineoplastic in the palliative treatment of some carcinomas - called also mitomycin C  .
 
 
 
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