Table 1. Percentage composition of the volatile fresh and dry lettuce oils.

Compound name	M.W.	Molecular formula	Retention time (min)	Fresh leaves (%)	Dry leaves (%)
α-Pinene	136	C10H16	5.600	5.11	0.62
3-Octanone	128	C8H16O	6.960	0.12	0.12
β-Pinene	136	C10H16	7.110	0.22	0.22
α-Terpinolene	136	C10H16	7.950	0.31	0.31
p-Cymene	134	C10H14	8.190	2.07	1.92
α-Terpinene	136	C10H16	9.390	1.35	1.35
Linalool	154	C10H18O	10.862	3.09	2.98
4-Terpineol	154	C10H18O	13.968	0.46	0.46
α-Terpineol	154	C10H18O	14.513	0.46	0.46
O-Methylthymol	164	C11H16O	16.699	0.30	0.30
Thymol	150	C10H14O	18.750	11.55	10.73
Durenol	150	C10H14O	19.195	52.00	49.98
Thymol acetate	192	C12H16O2	22.001	0.99	0.67
Caryophyllene	204	C15H24	23.892	2.11	1.98
L-Alloaromadendrene	204	C15H24	24.673	0.29	0.29
Viridiflorene	204	C15H24	26.904	0.17	0.17
α-Pinene	220	C15H24O	30.035	0.54	0.54
3-Octanone	220	C15H24O	30.240	0.62	0.62
Limonene	137	C10H17	32.700	1.28	1.11
Camphene	136.2	C10H16	32.710	4.11	3.65
Total				83.07	79.88