(αS,5R)-α,2-Diamino-4,5-dihydro-1H-imidazole-5 Propanoic Acid (L-Enduracididine) is a rare amino acid residue component of teixobactin (peptide antibiotic) and has antimicrobial activity in vitro and in vivo against various antibiotic-resistant strains of staphylococci.