Virginiamycin S1 is a streptozotocin B antibiotic produced by Streptomyces verticillioides, which has antibacterial activity by inhibiting bacterial protein synthesis at the level of aminoacyl-tRNA binding and peptide bond formation.

Metronidazole acetic acid is a metabolite of Metronidazole with mutagenic activity in bacteria.

2'-O-Methyl-2-thiouridine is a purine nucleoside analogue present in synthetic thermophilic bacterial tRNAs. 2'-O-Methyl-2-thiouridine is more selective for A than unmodified U.