The cyclothiazomycins are a group of natural products produced by various Streptomyces species of bacteria. These compounds are ribosomally synthesized and post-translationally modified peptides (RiPPs) and can be further classified as thiopeptides. The overall structure of the cyclothiazomycins comprises a macrocyclic bicyclic peptide containing several thiazoles and thiazolines. The cyclothiazomycins are reported to have multiple inhibitory effects ranging from decreasing blood pressure to interfering with RNA transcription; they also exhibit some antibiotic activity.

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