Table 1.

Chemical constituents of essential oil derived from Chenopodium ambrosioides

Compound	RI*	Chemical Formula	Relative Area (%)
α-Pinene	931	C10 H16	1.3
β-Pinene	981	C10 H16	0.3
δ-4-Carene	1002	C10 H16	1.9
α-Terpinene	1017	C10 H16	1.1
ρ-Cymene	1024	C10 H14	12.7
ρ,α-Dimenthylstyrene	1118	C10 H12	0.7
trans-ρ-Mentha-2,8-dienol	1126	C11 H18 O2	0.6
trans-ρ-2,8-Menthadien-1-ol	1139	C10 H16 O	0.6
2-Ethylcyclohexanone	1158	C8 H14 O	0.9
α,α-4-Trimethylbenzyl alcohol	1182	C10 H14 O	2.8
cis-Piperitol	1196	C10 H16	0.5
(Z)-Ascaridole	1245	C10 H16 O2	29.7
Piperitone	1250	C10 H16	5.0
3,4-Epoxy-ρ-menthan-2-one	1276	C10 H16 O2	4.1
Thymol	1292	C10 H14 O	1.1
Carvacrol	1298	C10 H14 O	4.9
Isoascaridole	1295	C10 H16 O2	13.0
Precocene II	1368	C13 H16 O3	1.5
Caryophyllene oxide	1584	C15H24O	2.2
Geranyl tiglate	1700	C15 H24	0.8
Hexahydrofarnesyl acetone	1842	C18 H36 O	1.7
Phytol	2119	C20 H40 O	1.2
Total			88.6

^*RI, retention index as determined on a HP-5MS column using the homologous series of n-hydrocarbons;