General Experimental Procedures. Specific optical rotations ([α]D) were measured on a polarimeter in a 100 × 2 mm cell at 22 °C. NMR spectra were obtained on a Bruker Avance DRX600 or DRX500 spectrometers, in the solvents indicated and referenced to residual 1H and 13C signals in deuterated solvents. Electrospray ionization mass spectra (ESIMS) were acquired using an Agilent 1100 Series separations module equipped with an Agilent 1100 Series LC/MSD mass detector in both positive and negative ion modes. High-resolution ESIMS measurements were obtained on a Bruker micrOTOF mass spectrometer by direct infusion in MeCN at 3 mL/min using sodium formate clusters as an internal calibrant. HPLC was performed using an Agilent 1100 Series separations module equipped with Agilent 1100 Series diode array and/or multiple wavelength detectors and Agilent 1100 Series fraction collector, controlled using ChemStation Rev.B02.01 and Purify version A.1.2 software.