2.3.5. Xanthoquinodin B13 (**5**)

Yellow, amorphous solid; [α] 20 <sup>D</sup> + 489◦ (*c* 0.001, MeOH); UV (MeOH) λmax (log ε) 199 (4.6), 274(3.9), 354 (4.3); CD (*c* 1.6 <sup>×</sup> 10–3 M, MeOH) <sup>λ</sup>max (Δε) 228 (+12.74), 264 (+2.90), 323 (+15.04), 360 (+13.37); 1H-NMR and 13C-NMR see Table 2; ESI-MS: *m*/*z* 615.18 (M <sup>−</sup> H) <sup>−</sup> and 617.19 (M + H)+; HRESIMS *m*/*z* 617.1650 (M + H)<sup>+</sup> (calculated for C33H29O12, 617.1654).


**Table 2.** 1D-NMR spectroscopic data for compounds **5**–**7** (in CDCl3).
