Bioactivities of Flavonoids from Lopezia racemosa

Figure 4

(a) FAB⁺ mass spectrum of 4, showing the [M+Na]⁺ (m/z 487), the [M+H]⁺ (m/z 465), [quercetin+H]⁺ (m/z 303), and the base peak [quercetin+Na-H₂O]⁺. (b) UV absorption spectra of 4 in MeOH and shift observed after the addition of displacement reagents.

(a)

(b)