## 3 Results and Discussion
### Nmr
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Number a**} & **Rt** & **Molecular** & \multicolumn{4}{c}{**Fragments (\(ml\)/z)**} & \multirow{2}{*}{**Compound**} & **W1** & **W2** & **W3** & **W4** \\  & **(min)** & **Formula** & **1 b** & **2** & **3** & & & & \\ \hline CP1 & 7.81 & C\({}_{10}\)H\({}_{8}\)O\({}_{3}\) & 177.2405 & 133.1216 & 121.1081 & 7-methoxycomarin * & + & + & + & - \\ CP2 & 12.13 & C\({}_{15}\)H\({}_{16}\)O\({}_{9}\) & 341.2512 & 323.1103 & 305.0924 & Unknown & - & + & - & - \\ CP3 & 12.52 & C\({}_{15}\)H\({}_{16}\)O\({}_{9}\) & 341.0807 & 179.0340 & 151.0388 & Esculetin-6-O-glucose & - & + & - & - \\ CP4 & 19.73 & C\({}_{16}\)H\({}_{16}\)O\({}_{9}\) & 355.1029 & 163.0392 & 145.0287 & Chlorogenic acid \({}^{\rm c}\) & + & + & + & + \\ CP5 & 21.17 & C\({}_{27}\)H\({}_{30}\)O\({}_{16}\) & 611.1611 & 465.1029 & 303.0501 & Rutin * & + & + & + & + \\ CP6 & 21.95 & C\({}_{27}\)H\({}_{30}\)O\({}_{14}\) & 579.1710 & 433.1132 & 271.0603 & Apigenin-O- & - & + & - & - \\  & & & & & & (deoxyhexosyl)hexoside \({}^{\rm c}\) & - & + & - & - \\ CP7 & 22.31 & C\({}_{21}\)H\({}_{20}\)O\({}_{10}\) & 433.1135 & 415.1034 & 397.0923 & Isovitexin \({}^{\rm c}\) & - & - & - & + \\ CP8 & 24.49 & C\({}_{28}\)H\({}_{30}\)O\({}_{16}\) & 625.2113 & 607.1564 & 589.3071 & Lucenin-2 4\({}^{\prime}\)-methylether \({}^{\rm d}\) & + & + & + & - \\ CP9 & 25.61 & C\({}_{23}\)H\({}_{30}\)O\({}_{15}\) & 573.1811 & 551.2143 & 227.1936 & Genipin-\(\beta\)-gentiobioside \({}^{\rm e}\) & + & + & + & + \\ CP10 & 26.68 & C\({}_{27}\)H\({}_{30}\)O\({}_{14}\) & 581.1881 & 419.1349 & 237.063 & Narriutin * & + & + & + & + \\ CP11 & 27.55 & C\({}_{28}\)H\({}_{30}\)O\({}_{15}\) & 611.1994 & 449.1457 & 303.0870 & Hegerridin * & + & + & + & + \\ CP12 & 28.91 & C\({}_{28}\)H\({}_{30}\)O\({}_{15}\) & 611.1987 & 494.1447 & 303.0871 & Neboesperidin * & + & + & + \\ CP13 & 29.87 & C\({}_{15}\)H\({}_{18}\)O\({}_{5}\) & 279.1243 & 261.1294 & 243.1027 & Meranzin hydrate *,x & + & + & + \\ CP14 & 30.88 & C\({}_{15}\)H\({}_{10}\)O\({}_{6}\) & 287.0553 & 258.0522 & 213.0543 & Kaempfer *,c & - & + & - \\ CP15 & 31.14 & C\({}_{11}\)H\({}_{6}\)O\({}_{3}\) & 187.0401 & 159.0444 & 143.0499 & Angelicin \({}^{\rm c}\) & + & - & - \\ CP16 & 31.36 & C\({}_{21}\)H\({}_{20}\)O\({}_{11}\) & 449.1078 & 303.0501 & 229.0495 & Quercitrin \({}^{\rm c}\) & - & + & - \\ CP17 & 32.28 & C\({}_{20}\)H\({}_{24}\)O\({}_{11}\) & 441.2495 & 352.3446 & 282.2769 & Unknown & + & + & - & - \\ CP18 & 33.88 & C\({}_{21}\)H\({}_{20}\)O\({}_{12}\) & 465.4033 & 303.2861 & 274.3367 & Isoquercitin * & + & + & + & + \\ CP19 & 34.83 & C\({}_{28}\)H\({}_{32}\)O\({}_{15}\) & 609.1820 & 463.1244 & 301.1069 & Diosmetien-7-O-trutinoside \({}^{\rm c}\) & - & + & + \\ CP20 & 35.62 & C\({}_{15}\)H\({}_{10}\)O\({}_{7}\) & 303.0507 & 285.0409 & 257.0453 & Quercetin \({}^{\rm c}\) & + & + & + \\ \hline \hline \end{tabular}  
* Compound numbers are denoted as CPX (X = 1-20), ab represents the main fragment ion [M+H],
* indicates confirmation through standard compounds; \({}^{\rm c-e^{\prime}}\) represents references [21, 22, 23]. x indicates determination through nuclear magnetic resonance analysis. *+ indicates the presence of the compound; \({}^{\rm c}\)–” indicates the absence of the compound.  
\end{table} 
Table 2: The chemical constituents of Wendan pomelo peel from four areas.