Isolation and Structure Elucidation of Pamamycin-621, a New Macrodiolide Antibiotic fromStreptomyces aurantiacus

Abstract
Pamamycin-621 (II) was isolated from the mycelium of Streptomyces aurantiacus IMET 43917 and characterized as a new macrodiolide antibiotic by MS, NMR and chemical degradation experiments.