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Metal-containing novel heterocyclic antibiotics, micacocidin A (1), B (2), and C (3) have been isolated from the culture filtrate of Pseudomonas sp. No. 57-250. The structure and absolute configuration of micacocidin A, an octahedral Zn2+ complex, was determined by X-ray crystallographic analysis. And then, the structures of the two congeners, micacocidin B (Cu2+ complex) and C (Fe3+ complex) were investigated by employing one dimensional and two dimensional homonuclear and heteronuclear NMR spectroscopies and mass spectrometry.In the accompanied paper1), the taxonomy, fermentation, isolation, physico-chemical properties, and biological activities of micacocidin A, B, and C were reported.Herein, we describe the account of the structure determination of micacocidin A (1) and two congeners (2 and 3), metal chelated antibiotics having specific and excellent activity against Mycoplasma species (Fig. 1). Materials and Methods Spectroscopic StudiesLiquid secondary ion mass spectra (LSI-MS) were obtained by using a Hitachi M-90 mass spectrometer (BEE geometry) equipped with cesium ion gun. Samples were dispersed in 3-nitrobenzyl alcohol and introduced into the mass spectrometer on a LSI-MS target. One dimensional (1D) and two dimensional (2D) NMR were

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