“…3b: Rf 0.25 [eluent, 1-propanol: ethyl acetate:water (7:7:2)]; tR 46.5 min [gradient, 55%-61% MeCN in water (72 min); flow rate, 1.0 ml/min]; 1 H-NMR (Me 2 SO-d6-D 2 O): δ 2. 2.37,2.39,2.44,2.48 (CH 3 ),3,4,5,6),4.57,4.64,4.67,4.71,4.77,4.82,4.89 (8H,6.94,6.96,7.02,7.03,7.04 (10H,ArH). 3c: Rf 0.25 [eluent, 1-propanol:ethyl acetate:water (7:7:2)]; tR 51.4 min [gradient, 55%-61% MeCN in water (72 min 3,4,5,6),4.64,4.70,4.78,4.87,4.89 (8H,6.98,7.00,7.02,7.03,7.04 (10H,ArH).…”