ISOLATION OF A NEW PEPTIDE ANTIBIOTIC COMPLEX 61-26

STUDIES ON ANTIBIOTICS FROM THE GENEUS BACILLUS. V

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A new antibiotic named 61-26 active against gram-positive bacteria and some fungi was isolated from a Bacillus strain. The antibiotic is a weakly basic peptide slightly soluble in aqueous alcohols. An approximate empirical formula of C₅₀H₉₃-N₁₁O₁₇ and constituent amino acids of aspartic acid (1 mole), serine (2 moles), alanine (2 moles), and sum of valine and isoleucine (2 moles) are indicated.