Table 1.

Chemical composition of the essential oil from the root bark of P. sepium.

Compounda	RIb	RA (%)c
β-Myrcene	950	2.0
β-Thujene	991	2.3
β-(Z)-Ocimene	1012	0.6
Linalool	1075	2.2
Borneol	1154	0.8
Terpinen-4-ol	1166	1.1
α-Terpineol	1181	2.6
Bornyl acetate	1286	0.8
2-Hydroxy-4-methoxybenzaldehyde	1352	78.8
Paeonol	1459	0.6
Vanillin	1477	0.3
Methyl 4-methoxysalicylate	1483	0.4
n-Hexadecoic acid	1960	0.8
Ethyl palmitate	2017	0.6
α-Linoleic acid	2082	0.6
Ethyl linolate	2090	0.5
Ethyl oleate	2092	0.8
Total identified		95.8
Monoterpenoids		12.4
Phenolics		80.1
Aliphatics		3.3

^a: The identified constituents are listed in their order of elution. ^b: RI indicates the retention indices calculated against C₈-C₄₀ n-alkanes on the HP-5MS column. ^c: RA indicates relative amount (peak area relative to the total peak area).