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streptozotocin
strep·to·zot·o·cin
noun An antibiotic, C8H15N3O7, produced by an actinomycete (Streptomyces achromogenes) and active against tumors but damaging to insulin-producing cells and now also regarded as a carcinogen.
Origin: strepto- + zo(o)- + -tocin (alteration of toxin).