摘要:
                                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.