GeneralThe 1H- and 13C-NMR spectra were measured on a Bruker AV 400 NMR spectrometer in CDCl3,using TMS as an internal standard. Chemical shifts (δ) are expressed in parts per million (ppm). TheHR-ESI-TOF mass spectra were obtained from a MDS SCIEX API QSTAR-MS instrument. Columnchromatographies were carried out with silica gel 60M (200-300 mesh) and AB-8 macroporous resinand HPLC were carried out on an LC-2010 system (Shimadzu).
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