Table 2.

Chemical composition of the essential oil from Cistus monspeliensis analyzed by GC/MS.

N°	Compound	Chemical structure	RT (min)	RI	Amount (mg/100gDM)
1	Benzaldehyde		9.13	1296	0.45
2	2,4,4-Trimethylcyclopentanone		9.51	1322	1.93
3	Nonanal		11.29	1446	0.62
4	Phenylacetaldehyde		11.37	1451	0.90
5	6-Methyl-3,5-heptadien-2-one		12.04	1498	0.29
6	m/z 153, 109, 95, 81, 67, 55, 43	NI	12.46	1527	0.39
7	m/z 151, 110, 91, 83, 67, 55, 43	NI	12.68	1542	0.41
8	1-Phenyl-1,3-butadiene		12.80	1551	1.20
9	m/z 162, 126, 107, 91, 67, 55, 41	NI	13.81	1620	0.21
10	m/z 164, 151, 126, 111, 95, 79, 70, 55, 41	NI	13.99	1633	0.85
11	Vitispirane		14.34	1658	3.47
12	4-ethyl-1,2-dimethylbenzene		15.84	1762	1.72
13	Decanoic acid		15.89	1765	1.55
14	4-Hydroxy-3-methyl acetophenone		16.07	1778	0.17
15	Myrtenyl acetate		16.44	1803	0.24
16	Dihydro-β-ionone		16.84	1831	0.88
17	4-(4-Methylphenyl) pentanal		17.02	1844	0.25
18	m/z 216, 180, 85, 71, 57, 43	NI	17.50	1877	0.18.
19	β-Ionone		17.61	1885	0.18
20	Lauric acid		18.32	1934	0.91
21	m/z 205, 119, 117, 91, 77, 68, 55, 43	NI	19.85	2020	0.18
22	Myristic acid		20.71	2100	17
23	6,10,14-Trimethylpentadecan-2-one		20.97	2118	3.14
24	m/z 272, 228, 190, 121, 91, 87, 74, 55, 43	NI	21.89	2182	0.18
25	1-(6,10-Dimethylundeca-5,9-dien-2-yl)-4-methylbenzene		22.49	2224	2.95
26	m/z 284, 256, 213, 119, 91, 73, 55, 43	NI	22.61	2232	4.65
27	Palmitic acid		22.68	2237	10.81
28	3,3a,6,6,9a-Pentamethyldodecahydro-3,9b-epoxycyclopenta[a]naphthalene		23.19	2272	6.72
29	13-Epi-manoyl oxide		23.58	2299	68
30	m/z 228, 199, 146, 132, 119, 91, 67, 55, 43	NI	23.72	2309	0.84
31	m/z 254, 240, 189, 119, 105, 91, 79, 67, 55, 41	NI	24.02	2329	0.42
32	m/z 272, 209, 189, 105, 91, 79, 67, 55, 41	NI	24.06	2332	0.53
33	4-Caranol		24.41	2357	0.42
34	m/z 242, 196, 135, 123, 107, 95, 81, 69, 55, 43	NI	24.52	2364	0.66
35	Pentacosane		24.70	2377	2.83
36	m/z 292, 191, 124, 85, 71, 58, 43	NI	25.49	2431	0.28
37	m/z 284, 150, 119, 91, 67, 55, 43	NI	25.97	2465	0.17
38	Hexacosane		27.91	2600	1.04
39	Heptacosane		28.62	2649	0.07
40	Octacosane		29.35	2700	0.70

NI: not identified; RT: retention time; RI: retention index.