2.3.3. Xanthoquinodin B11 (**3**)

Yellow, amorphous solid; [α] 20 <sup>D</sup> + 438◦ (*c* 0.005, MeOH); UV (MeOH) λmax (log ε) 198 (4.5), 274 (3.6), 354 (4.1); CD (*c* 1.6 <sup>×</sup> 10–3 M, MeOH) <sup>λ</sup>max (Δε) 234 (–22.84), 263 (+2.78), 325 (+33.59), 353 (+19.33); 1H-NMR and 13C-NMR see Table 1; ESI-MS: *m*/*z* 643.19 (M <sup>−</sup> H)<sup>−</sup> and 645.24 (M + H)+; HRESIMS *m*/*z* 645.1966 (M + H)<sup>+</sup> (calculated for C35H33O12, 645.1967).
