2.3.1. Xanthoquinodin A11 (**1**)

Yellow, powder; [α] 20 <sup>D</sup> + 491◦ (*c* 0.005, MeOH); UV (MeOH) λmax (log ε) 199 (4.6), 274 (3.8), 345 (4.4); CD (*c* 1.6 <sup>×</sup> 10–3 M, MeOH) <sup>λ</sup>max (Δε) 228 (+14.90), 271 (+3.15), 326 (+28.27), 378 (+4.99); 1H-NMR and 13C-NMR see Table 1; ESI-MS: *<sup>m</sup>*/*<sup>z</sup>* 643.20 (M <sup>−</sup> H)<sup>−</sup> and 645.26 (M <sup>+</sup> H)+; high resolution electrospray ionisation mass spectrometry (HRESIMS) *m*/*z* 645.1965 (M + H)<sup>+</sup> (calculated for C35H33O12, 645.1967).
