“…The characteristic exudate flavonoids of this plant are the major products, 3'-desmethoxysudachitin (5,7,4'-trihydroxy-6,8-dimethoxy flavone) and xanthomicrol (5,4'-dihydroxy-6,7,8-trimethoxy flavone), and the minor components, scutellarein-6-methyl ether (hispidulin), luteolin-7-methyl ether, 6-methoxy luteolin (nepetin), sideritiflavone (5,3',4'-trihydroxy-6,7,8-trimethoxy flavone), kaempferol, quercetin, rhamnetin (quercetin-7-me), rhamnazin (quercetin-7,3'-diMe) and ombuin (quercetin-7,4'-diMe). The presence of two coumarins, scopoletin and ayapin, is also typi cal for the "fingerprint" of Am brosia deltoidea on TLC, where they appear as light blue fluorescent spots (Wollenweber et al, 1987b). Thus, their pres ence in these propolis samples confirms this plant source.…”