543.422.25 Several skeletal and oxidative transformations of 11-deoxyglycyrrhetic acid were carried out to produce A-nor-derivatives. Signals for protons and C atoms in the PMR and 13 C NMR spectra of the A-norderivatives were assigned using high-resolution 1 H (400 MHz) and 13 C (125 MHz) NMR spectroscopy.
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