Wiktionary
thiostrepton
n. (context medicine English) A cyclic oligopeptide antibiotic, derived from several strains of ''Streptomyces'' bacteria
Wikipedia
Thiostrepton
Thiostrepton is a natural cyclic oligopeptide antibiotic, derived from several strains of streptomycetes, such as Streptomyces azureus and Streptomyces laurentii. Thiostrepton is a natural product of the ribosomally synthesized and post-translationally modified peptide (RiPP) class.