NMR:
1H-‐NMR (400MHz, CDCl3): δH 7.59 (d, J=8.6 Hz, 1H, H-‐5), 7.35 (d, J=8.6 Hz, 2H, H-‐18 or 19), 7.33 (d,J=2.2 Hz, 1H, H-‐2), 7.27 (d, J=8.5 Hz, 2H, H-‐18 or 19), 7.11 (d, J=8.6 Hz,1H, H-‐6), 6.53 (d, J=0.7 Hz,1H, NH), 5.27 (brs,1H, H-‐16), 3.84 (brs,1H, H-‐15), 3.55 (s, 3H, H-‐11), 2.90-‐2.68 (m, 4H, H-‐13a/13b/21a/21b), 2.37 (s, 3H, H-‐10), 2.27-‐2.09 (m, 2H, H-‐14a/22),1.82-‐1.73 (m,1H, H-14b), 1.06 (dd, J=6.8, 2.9 Hz, 6H, H-‐23);
13C-‐NMR (100 MHz,CDCl3): δC 169.7 (C-‐12),162.1 (C-‐7),146.0 (C-‐4),143.8 (C-‐1),140.6 (C-‐3),137.0 (C-‐17),134.6 (C-‐20),129.4 (C-‐18 or 19), 128.2 (C-‐18 or 19), 126.1 (C-‐5), 121.6 (C-‐8), 121.0 (C-‐6),120.5(C-‐9),113.6(C-‐2),71.1(C-‐16),62.0(C-‐21),53.9(C-‐15),29.5(C-‐11),27.7(C-‐13), 25.1 (C-‐22), 22.7 (C-‐23), 22.6 (C-‐14),19.0 (C-‐10)
