Analytical and preparative HPLC was conducted on a Prominence modular HPLC instrument (Shimadzu) equipped with a SPD-20A UV/Vis detector (Shimadzu) using Gemini NX C18 RP columns (Phenomenex). The column used for analytical runs has internal dimensions of 150 mm × 4.6 mm, 3 µm particle size, and 110 Å pore size. The column used for preparative runs has internal dimensions of 250 mm × 21.2 mm, 5 µm particle size, and 110 Å pore size.