3.2.4. Compound **5**

Colorless gum (1.3 mg, 3%); UV (MeOH) λmax (log ε) 243 (3.95), 283 (3.19), 328 (3.08) nm; IR (UATR) νmax 3400, 2972, 1747, 1705, 1279, 1199, 1165, 1078, 976, 712 cm−1; 1H NMR (800 MHz, CD3OD) δ<sup>H</sup> 2.08 (3H, t, *J* = 18.4 Hz, H-17), 3.73 (3H, s, 12-OMe), 3.75 (3H, s, 13-OMe), 3.88 (3H, s, 7-OMe), 3.97 (3H, s, 6-OMe), 4.56 (2H, s, H-9), 6.80 (1H, dd, *J* = 8.3, 2.0 Hz, H-15), 6.83 (1H, d, *J* = 8.3 Hz, H-14), 6.95 (1H, d, *J* = 2.0 Hz, H-11), 7.34 (1H, s, H-5), 7.46 (1H, s, H-8), 7.86 (1H, s, H-4); 13C NMR (200 MHz, CD3OD) δ<sup>C</sup> 24.4 (t, <sup>2</sup>*J*CF = 28.7 Hz, C-17), 41.9 (C-9), 56.3 (12-OMe), 56.39 (13-OMe), 56.41 (7-OMe), 56.5 (6-OMe), 107.4 (C-5), 105.5 (C-8), 113.0 (C-14), 113.4 (C-11), 115.7 (t, <sup>3</sup>*J*CF = 5.3 Hz, C-4), 121.8 (C-15), 122.5 (t, <sup>1</sup>*J*CF = 237.4 Hz, C-16), 124.3 (C-8a), 133.5 (C-10), 135.0 (C-4a), 147.6 (t, <sup>2</sup>*J*CF = 28.3 Hz, C-3), 149.0 (C-13), 150.4 (C-12), 152.3 (C-7), 154.7 (C-6), 159.8 (C-1); (+)-LRESIMS *m*/*z* (rel. int.) 404 (100) [M + H]+; (+)-HRESIMS *m*/*z* 426.1478 [M + Na]<sup>+</sup> (calcd for C22H23F2NO4Na, 426.1487).
