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Tyrocidine 
An antibiotic mixture produced by Bacillus brevis which may be separated into three components, tyrocidines A, B, and C. It is the major constituent (40-60 per cent) of tyrothricin, gramicidin accounting for the remaining 10-20 per cent active material. It is a topical antimicrobial agent, that is very toxic parenterally.     
Pharmacological Action Anti-Bacterial Agents; Anti-Infective Agents, Local
Other names Tyrocidines; Rapicidin; Brevicidin
 
SubstanceCAS Registry & nameCategoriesSourceDrugs*
tyrocidine thioesterase  EC 3.1.-   *Esterases *Tyrocidine.  Bioorg Med Chem Lett. 2002 Mar 25;12(6):989-92
6-valine-tyrocidine A  79774-98-4 Tyrocidine A, 9-L-valine-, monohydrochloride  Tyrocidine/*analogs & derivatives.  Int J Pept Protein Res 1981;18(2):127
7-ornithine-tyrocidine A  79774-99-5 Tyrocidine A, 10-L-ornithine-, dihydrochloride  Tyrocidine/*analogs & derivatives.  Int J Pept Protein Res 1981;18(2):127