#polypeptide antibiotic
- Bacitracin — A broad-spectrum polypeptide antibiotic produced through biosynthesis by specific strains of Bacillus subtilis or Bacillus licheniformis. This structural pharmacological compound acts by inhibiting bacterial cell wall synthesis, being primarily used in topical applications (ointments, creams) to prevent and treat superficial skin and eye infections caused by Gram-positive bacteria.