## 2 The Phytochemistry of _Artemisia annua_ L. (Qinghao)
### Flavonoids
\begin{table}
\begin{tabular}{|l|l|l|l|l|} \hline
**Name** & **Alternative Name(s)** & **CAS Number** & **References** \\ \hline Quercetageetin & 3-methyl & 3’,4’,5,6,7,-Pentalhydroxy-3-methoxyflavone & [64190-88-1] & [89] \\ ether (**221**) & & 2-(3,4-Dihydoxyphenyl)-5,6,7-trihydroxy-3-methoxy-\(\mathit{4H}\)-1- & benzopyrann-4-one \\ Axillarin (**222**) & Quercetageetin 3,6-dimethyl ether & [5188-73-8] & [76, 84] \\  & & 3’,4’,5,7-Tetrahydroxy-3,6-dimethoxyflavone & \\  & & 2-(3,4-Dihydroxyphenyl)-5,7-dihydroxy-3,6-dimethoxy-\(\mathit{4H}\)-1- & benzopyrann-4-one & \\ Quercetageetin-3,4’- & 3’,5,6,7-Tetrahydroxy-3,4’-dimethoxyflavone & [59171-34-5] & [76] \\ dimethyl ether (**223**) & 3,3’,4’,5,6,7-Hexahydroflavone & 3,4’-di-methyl ether & \\ Bonanzin (**224**) & 5,7-Dihydroxy-3,3’,4’,6-tetramethylflavone & [35688-42-7] & [96] \\  & & 2-(3,4-Dimethoxyphenyl)-5,7-dihydroxy-3,6-dimethoxy-\(\mathit{4H}\)-1- & benzopyrann-4-one & \\ Chrysosplenol D (**225**) & 2-(3,4-Dihydroxyphenyl)-5-hydroxy-3,6,7-trimethoxy-\(\mathit{4H}\)-1- & benzopyrann-4-one & [14965-20-9] & [15, 76, 84, 92, 94, 95, 98] \\ Chrysosplenetin (**226**) & Chrysosplenol B & [603-56-5] & [61, 76, 80, 84, 91, 92, 95, 96, 99-101] \\  & 5,4’-Dihydroxy-3,6,7,3’-tetramethylflavone & [479-91-4] & [76, 84, 91, 94, 95, 94, 95, 98, 99, 99, 100, 103] \\ Caticin (**227**) & Quercetageetin 6,3,7,4'-tetramethyl ether & [479-90-3] & [15, 75, 77, 78, 80, 94, 95, 96, 98, 100, 106] \\  & 3’,5-Dihydroxy-3,4’,6,7,-tetramethylflavone & [19833-27-3] & [84] \\  & 5-Hydroxy-2-(3-hydroxy-4-methoxy)-3,6,7-trimethoxy-\(\mathit{4H}\)-benzopyrann-4-one & [479-90-3] & [15, 75, 77, 78, 80, 94, 95, 96, 98, 100, 106] \\ Artemetin (**228**) & 5-Hydroxy-3,6,7,3’,4'-Pentamethylflavone & [479-90-3] & [15, 75, 77, 78, 80, 94, 95, 96, 98, 100, 105, 106] \\  & 2-(3,4,-Dimethoxyphenyl)-5-hydroxy-3,6,7-trimethoxy-\(\mathit{4H}\)-1- & [19833-27-3] & [84] \\  & & 6-Methodykaempfed- 3-\(O\)-glucose & [519-96-0] & [84] \\  & & 2-(3,4-Dihydroxyphenyl)-3,5,7-trihydroxy-6-methoxy-\(\mathit{4H}\)-1- & benzopyrann-4-one & \\ Cirsilineol (**231**) & 3’,4’,5,6,7-Pentalhydroxy-3,6,7-trimethyl ether & [41365-32-6] & [76, 94, 95, 98] \\  & 4',5-Dihydroxy-3’,6,7,-trimethoxyflavone & [9587-65-6] & [61, 77, 98] \\ Eupatin (**232**) & 3,3’,5-Trihydroxy-4’,6,7-trimethoxyflavone & [19587-65-6] & [61, 77, 98] \\  & 3,5-Dihydroxy-2-(3-hydroxy-4-methoxyphenyl)-6,7-dimethoxy- & & \\  & 4_H_-1-benzopyrann-4-one & & \\  & 3’,5-Dihydroxy-4’,6,7-trimethoxyflavonol & & \\ Quercetageetin -6,7,3’,4’- & 3,5-Dihydroxy-3’,4’,6,7-tetramethylflavone & [57296-14-7] & [61, 71, 77, 105, 107] \\ tetramethylether & 3,3’,4’,5,6,7-Hexahydroflavone 3’,4’,6,7-tetra methyl ether & [7] & [61, 71, 77, 105, 107] \\ (**233**) & Quercetageetin & 4’-methyl & 3,3’,4’,5,6,7-Hexahydroflavone 4’-methyl ether & [161585-86-9] \\ ether (**234**) & 3,3’,5,6,7-Pentahydro-4’-methoxyflavone & [0] & \\  & & 3’,5,6,7-Tetrahydroxy-4’-methoxyflavonol & & \\ \hline \end{tabular}
\end{table} 
Table 21: Quecetageetin (Hexahydro) Flavonols. The miscellaneous polycyclic aromatic natural product acenaphthylene, 1,2,4,5-tetrahydro-([54271-92-0]) **(241)** is also reported from _A. annua_[34].