Any of a group of antibiotics produced by the soil actinomycete Streptomyces caespitosus that inhibit DNA synthesis and are used against bacteria and cancerous tumor cells.

• 自力霉素任何一组由土壤放线菌类尖状链菌霉产生的抗生物质，它抑制脱氧核糖核酸形成，用来抗菌及抗癌症肿瘤细胞