“…m.p. 237 °C); [α] D 25 = -151 ( c 1.45 mg/mL, CHCl 3 ); 1 H NMR (500 MHz, CDCl 3 ) δ: 7.54 (brs, 1H, -CN-O H ), 7.41 (s, 1H), 7.40 (s, 1H), 6.35 (s, 1H, H-22), 5.46 (s, 1H, H-17), 4.69 (d, J = 13.0 Hz, 1H, H-19), 4.36 (d, J = 13.0 Hz, 1H, H-19), 3.99 (s, 1H, H-1), 3.80 (s, 1H, H-15), 3.57 (d, J = 12.5 Hz, 1H), 2.98 (dd, J = 17.0, 3.5 Hz, 1H), 2.70 (d, J = 16.5 Hz, 1H), 2.42 (d, J = 11.0 Hz, 1H), 1.93–2.02 (m, 2H), 1.79–1.88 (m, 2H), 1.73–1.78 (m, 1H), 1.47–1.53 (m, 1H), 1.32 (s, 3H), 1.23 (s, 3H), 1.19 (s, 3H), 0.96 (s, 3H); HRMS (ESI): calcd for C 26 H 31 NO 8 Na ([M + Na] + ), 508.1942; found, 508.1944.…”