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- 1H NMR spectra were recorded at 80 MHz with a BRUKER WP 80 spectrometer. Gas chromatographic analyses were performed on a GIRDEL 3000 instrument, using columns filled with Carbowax 20M (15 %) and potassium hydroxide (5 %) on 60–80 mesh Chromosorb P. The products exhibited physical and spectral characteristics in agreement with literature data (or with their structure for new compounds)