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New o-, m- and p-nitrobenzyl esters of lasalocid (o-ELAS, m-ELAS and p-ELAS) have been synthesised and studied by X-ray, 1 H, 13 C NMR, FT-IR, UV–Vis, fluorescence as well as PM5 semiempirical methods. The crystal structure of o-ELAS is stabilized by three intramolecular hydrogen bonds in which the ketone is not engaged. The FT-IR spectra of o-ELAS, m-ELAS and p-ELAS in the chloroform...
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