Table 1.

Mean percentage of terpene compounds in the essential oil of T. polium

No.	Compounds	RI	Percentage
Monoterpene hydrocarbons
1	α-Thujene	925	0.5
2	α-Pinene	934	3.1
3	Sabinene	973	0.8
4	β-Pinene	977	4.2
5	Myrcene	983	0.4
6	Limonene	1025	1.7
Sesquiterpenes
7	α-Copaene	1377	0.5
8	β-Caryophyllene	1426	9.8
9	α-Humulene	1456	2.4
10	Dehydro-sesquicineol	1475	3.7
11	β-Bisabolene	1505	1.4
12	γ-Cadinene	1521	0.9
13	Germacrene-B	1560	1.2
Oxygenated sesquiterpenes
14	Spathulenol	1584	0.4
15	Caryophylleneoxide	1588	5.3
16	Gossonerol	1645	1.5
17	β-Bisabolol	1676	0.5
18	α-Bisabolol	1701	24.6
19	11-Acetoxyeudesman-4-α-ol	1950	26.3
	Percentage of monoterpenes		10.7
	Percentage of sesquiterpenes		78.5
	Total		89.2

RI retention indices