## 2 Results and Discussion
### Phytochemical Composition of Essential Oil
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & & **Compounds** & \multicolumn{2}{c}{**Chemical Classes**} & \multicolumn{2}{c}{**RI**} & \multicolumn{2}{c}{**Column**} \\ \cline{3-6}  & & **Compounds** & \multicolumn{2}{c}{**Chemical Classes**} & \multicolumn{2}{c}{**HP-5 MS**} & \multicolumn{2}{c}{**DB-H.WAX**} \\ \hline
**Peak** & **RT (min)** & & & **Obs** & **Lit** & **(\%)** & **(\%)** \\ \hline
1 & 7.84 & \(\alpha\)-Pinene & Monoterpene (MO) & 937 & 939 & 1.03 \(\pm\) 0.01 & 0.93 \(\pm\) 0.01 \\ \hline
2 & 8.23 & Camphene & MO & 946 & 946 & 1.07 \(\pm\) 0.01 & 0.94 \(\pm\) 0.02 \\ \hline
3 & 10.13 & Yomogi alcohol & MO & 999 & 999 & 0.43 \(\pm\) 0.01 & 0.36 \(\pm\) 0.01 \\ \hline
4 & 10.79 & \(\alpha\)-Cymene & MO & 1020 & 1026 & 4.81 \(\pm\) 0.02 & 4.71 \(\pm\) 0.06 \\ \hline
5 & 11.01 & 1,4-Cineole & MO & 1046 & 1031 & 4.11 \(\pm\) 0.01 & 3.94 \(\pm\) 0.01 \\ \hline
6 & 11.10 & Limonene & MO & 1023 & 1029 & 0.75 \(\pm\) 0.01 & Nt \\ \hline
7 & 12.16 & Terpinolene & MO & 1072 & 1088 & 1.42 \(\pm\) 0.01 & 1.34 \(\pm\) 0.01 \\ \hline
8 & 12.69 & Fenchon & MO & 1087 & 1086 & 0.91 \(\pm\) 0.01 & Nt \\ \hline
9 & 13.48 & \(\alpha\)-Thujone & MO & 1105 & 1102 & 18.64 \(\pm\) 0.07 & 17.45 \(\pm\) 0.31 \\ \hline
10 & 13.66 & Linalool & MO & 1105 & 1099 & 1.05 \(\pm\) 0.01 & 1.93 \(\pm\) 0.01 \\ \hline
11 & 13.81 & \(\beta\)-Thujone & MO & 1198 & 1114 & 4.30 \(\pm\) 0.04 & 5.12 \(\pm\) 0.23 \\ \hline
12 & 14.58 & Camphor & MO & 1143 & 1146 & 24.26 \(\pm\) 0.31 & 25.41 \(\pm\) 0.22 \\ \hline
13 & 15.16 & Pinocarvone & MO & 1160 & 1164 & 0.95 \(\pm\) 0.01 & Nt \\ \hline
14 & 15.60 & Borneol & MO & 1166 & 1169 & Nt & 1.16 \(\pm\) 0.11 \\ \hline
15 & 15.68 & Bornyl acetate & Others (O) & 1283 & 1288 & 1.28 \(\pm\) 0.01 & 1.18 \(\pm\) 0.06 \\ \hline
16 & 16.08 & 4-terpineol & MO & 1177 & 1177 & 0.62 \(\pm\) 0.01 & Nt \\ \hline
17 & 16.25 & \(\alpha\)-Ionone & O & 1425 & 1430 & Nt & 0.88 \(\pm\) 0.01 \\ \hline
18 & 17.56 & Octanol acetate & MO & 1209 & 1213 & 1.65 \(\pm\) 0.01 & 2.05 \(\pm\) 0.14 \\ \hline
19 & 17.86 & Pulegone & MO & 1237 & 1237 & 1.27 \(\pm\) 0.18 & 0.92 \(\pm\) 0.10 \\ \hline
20 & 19.79 & Bornyl formate & O & 1595 & 1588 & 1.24 \(\pm\) 0.01 & 1.44 \(\pm\) 0.13 \\ \hline
21 & 20.17 & Thymol & MO & 1290 & 1290 & 9.53 \(\pm\) 0.8 & 9.24 \(\pm\) 0.83 \\ \hline
22 & 20.45 & Carvacrol & MO & 1300 & 1299 & 12.57 \(\pm\) 0.97 & 13.43 \(\pm\) 0.21 \\ \hline
23 & 21.81 & Nepetalactone & MO & 1369 & 1360 & 0.98 \(\pm\) 0.01 & Nt \\ \hline
24 & 24.32 & \(\beta\)-Caryophyllene & Sesquiterpene (ST) & 1420 & 1419 & Nt & 0.82 \(\pm\) 0.01 \\ \hline
25 & 24.83 & \(\tau\)-Elemene & ST & 1484 & 1438 & 0.82 \(\pm\) 0.01 & 0.89 \(\pm\) 0.01 \\ \hline
26 & 26.12 & Germacrene D & ST & 1708 & 1485 & 0.94 \(\pm\) 0.01 & Nt \\ \hline
27 & 28.26 & Germacrene B & ST & 1823 & 1561 & 0.64 \(\pm\) 0.01 & Nt \\ \hline
28 & 28.66 & Spathulenol & ST & 1576 & 1578 & 1.12 \(\pm\) 0.01 & 1.63 \(\pm\) 0.08 \\ \hline
29 & 28.76 & Caryophyllene oxide & ST & 1580 & 1583 & Nt & 0.62 \(\pm\) 0.01 \\ \hline
30 & 39.11 & Hexadecanoic acid & O & 1968 & 1968 & 0.66 \(\pm\) 0.01 & 0.72 \(\pm\) 0.01 \\ \hline  & \multicolumn{2}{c}{Chemical classes} & & & & & \\ \hline  & \multicolumn{2}{c}{Monoterpene (MO)} & & & & & \\ \hline  & \multicolumn{2}{c}{Sesquiterpene (ST)} & & & & & \\ \hline  & \multicolumn{2}{c}{Others (O)} & & & & & \\ \hline  & \multicolumn{2}{c}{Total identified (\%)} & & & & & \\ \hline \hline \end{tabular} RL = retention indices; RT. = Retention time in minutes; Obs. = retention indices determined relative to a homologous series of \(n\)-alkanes on HP-5 MS column and on DB-HeawyWAX column, Lit. = literature RI values; Column = composition of essential oil detected on HP-5 MS and DB-HeawyWAX columns; (\%) = relative percentage content; NT = not detected.  
\end{table} 
Table 1: Phytochemical compounds contained in the essential oil of _W. frutscens_.