Hand 13 C-NMR spectra were recorded on a Varian Mercury, Bruker AM 400 and Jeol Ex-270 instrument with a 300/75 MHz, 400/100 MHz and 500/125 MHz using CDCl3, DMSO or CD3OD solution with tetramethylsilane as internal standard. Mass spectra were determined using a Finnigan FINNIGAN SSQ 7000 mass spectrometer.
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