can't read?
Bacitracin is a mixture of related cyclic peptides produced by organisms of the licheniformis group of Bacillus subtilis var Tracy, first isolated in 1945.
B 1210 (OTTO) Bacitracin Cas 1405-87-4 - used to study disruption of bacterial cell wall synthesis at the level of peptidoglycan cross-linking and isoprenyl metabolism.