Novel calix[4]arene derivatives functionalized with two or four isosteviol units at the upper rim and a new calix[6]arene having six isosteviol moieties at the lower run have been synthesized. The structures of these compounds have been confirmed by NMR and mass spectrometry data. All H-1 and C-13 NMR chemical shifts of isosteviol were fully assigned by extensive NMR spectroscopic methods, and used to clarify the structures and conformations of isosteviol-calixarene, conjuates.
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