“…HCl (70 mL) and water (3 × 100 mL). After drying (Na 2 SO 4 ), filtration and evaporation of the solvent, the residue was purified by radial chromatography on silica gel using as gradient CH 2 C NMR δ: 8.6,9.2,14.4,16.0,17.90,17.92,27.1,93.5,97.5,104.1,125.0,128.7,129.3,136.0,139.2,140.1,145.3,147.3,164.9,165.6,172.1 ppm. 13 C NMR data from (CD 3 ) 2 SO are in Table 2.…”