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- The spectra data were taken with the following instruments. Melting points were determined using a Yanaco micro melting point apparatus and were uncorrected. The 1H and 13C NMR spectra were recorded on a Bruker AC 200 Spectrometer, and chemical shifts were given in ppm downfield from tetramethylsilane (TMS). IR spectra were taken with a Perkin Elmer 882 spectrophotomer and only noteworthy absorptions were listed. Mass spectra were measured on a VG 70-250S mass spectrometer by electronic impact at 70 eV (unless otherwise indicated)