Annonin I ( 1) and anonin VI ( 9) were isolated from the seeds of ANNONA SQUAMOSA L. (Annonaceae). The constitution of 1 is identical with that of squamocin, isolated by Fujimoto et al. (8). The relative configuration of 1 was elucidated by X-ray diffraction analysis of a derivative. The constitution and relative configuration of 9 was established by (13)C- and (1)H-NMR spectroscopy using data of derivatives.

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A trisaccharide containing an aminouronic acid moiety is the repeat unit of an oligosaccharide that represents the family‐specific immunodeterminant structure of Enterobacteriaceae. The synthesis of the derivative 1 of this trisaccharide has now been accomplished, which should enable the preparation of the corresponding synthetic antigens.

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