2.3.7. Xanthoquinodin B15 (**7**)

Yellow, amorphous solid; [α] 20 <sup>D</sup> + 425◦ (*c* 0.004, MeOH); UV (MeOH) λmax (log ε) 199 (4.4), 207 (4.3), 276 (4.0), 361 (4.1); CD (*<sup>c</sup>* 1.5 <sup>×</sup> 10–3 M, MeOH) <sup>λ</sup>max (Δε) 207 (–35.18), 231 (–17.20), 264 (+10.67), 323 (+37.35); 1H-NMR and 13C-NMR see Table 2; ESI-MS: *m*/*z* 661.19 (M <sup>−</sup> H)<sup>−</sup> and 663.27 (M + H)+; HRESIMS *m*/*z* 663.2072 (M + H)<sup>+</sup> (calculated for C35H35O13, 663.2072).
