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4.3 (400.0 mg) which was purified by Sephadex LH-20 (MeOH-H SB 2 sb O, 5:5) and semipreparative HPLC (CH SB 3 sb CN-H SB 2 sb O, 11:9). SP 1 sp H NMR (400 MHz, CDCl SB 3 sb , , ppm, J/Hz): 7.06 (2H, d, J = 8.4, H-2', 6'), 6.85 (2H, d, J = 8.4, H-3', 5'), 6.48 (1H, d, J = 11.6, H-20), 5.88 (1H, ddd, J = 15.0, 9.9, 2.2, H-13), 5.60 (1H, d, J = 11.6, H-19), 5.21 (1H, ddd, J = 15.0, 10.9, 3.8, H-14), 4.38 (1H, br.s, H-7), 3.77 (3H, s, 4'-OCH SB 3 sb ), 3.70 (1H, m, H-3), 2.99 (1H, dd, J = 5.2, 2.6, H-4), 2.93 (1H, ddd, J = 11.6, 6.8, 2.2, H-16), 2.83 (1H, dd, J = 13.7, 4.6, H-10a), 2.65 (1H, d, J = 4.6, H-10b), 2.62 (1H, overlapped, H-15a), 2.60 (1H, overlapped, H-8), 2.27 (1H, dd, J = 7.4, 5.2, H-5), 2.14 (1H, m, H-15b), 1.47 (3H, s, H-23), 1.25 (3H, s, H-12), 1.15 (3H, d, J = 6.8, H-22), 1.08 (3H, d, J = 7.4, H-11). SP 1 sp H NMR (400 MHz, DMSO-d SB 6 sb , , ppm): 9.19 (1H, s, 2-NH), 8.08 (1H, s, 4'-OH), 6.95 (2H, d, J = 8.4, H-2', 6'), 6.67 (2H, d, J = 8.4, H-3', 5'), 6.33 (1H, d, J = 12.7, H-20), 5.60 (1H, overlapped, H-19), 5.57 (1H, overlapped, H-13), 5.33 (1H, ddd, J = 15.2, 10.8, 4.3, H-14), 5.26 (1H, d, J = 2.2, H-7), 4.03 (1H, q, J = 7.1, H-3), 3.32 (1H, m, H-18), 2.93 (1H, m, H-4), 2.88 (1H, d, J = 9.2, H-8), 2.74 (2H, m, H-10), 2.71 (1H, m, H-16), 2.68 (1H, m, H-5), 2.46 (1H, m, H-15a), 2.03 (1H, m, H-15b), 1.67 (3H, s, H-12), 1.16 (3H, d, J = 6.9, H-22), 1.11 (3H, d, J = 6.8, H-23), 0.70 (3H, d, J = 7.2, H-11). [Extracted from the article]