ChemInform Abstract: A Novel Amino Acid Antibiotic TAN-950

A novel antifungal antibiotic, TAN-950 A, was isolated from the culture filtrate of Streptomyces platensis A-136. Its structure was determined to be (S)-2-amino-3-(isoxazolin-5-on-4-yl)-propanoic acid. Minor components, TAN-950 B, C, D and E, were found to be present in an equilibrium mixture containing TAN-950 A. Their structures were determined from spectral analyses. X-ray crystallographic analysis and synthesis from L-glutamic acid.