Persipeptides A and B, two cyclic peptides from Streptomyces sp. UTMC 1154

Two new N-methylated cyclopeptides, persipeptide A (1) and B (2), have been isolated from Streptomyces sp. UTMC1154. According to Marfey's method, all amino acids had the l-configuration. The two cyclic peptides had the same ring size and amino acid composition.