General Experimental Procedures.Melting points were determined on a Fisher-Johns apparatus and are uncorrected. Optical rotations were measured with a Perkin-Elmermodel 341 polarimeter.1 H(500MHz)and 13 C (125.7, and 75 MHz) NMR experiments were registered on a Varian Inova instrument. The NMR techniques were performed according
to a previously described methodology. Negative-ion LRFABMS were recorded using a matrix of triethanolamine on a ThermoDFS spectrometer. Negative-ion HRESIMS experiments were performed on a Bruker MicrO-TOF-Q high-resolution quadruple-time-of-flight massspectrometer