Table 2.

Terpenoid substances and their structural features used to study modulatory effects on GABA_ARs

Compound	Occurence	Class/functional group	Structure
2-Methyl-3-buten-2-ol	Hop	Hemi terpene Hydroxy
β-Citronellol	Geranium	Acyclic monoterpene Hydroxy
Terpinolene	Scots pine	Monocyclic monoterpene
Carveol	Spearmint	Monocyclic monoterpene Hydroxy
Isopulegol	Lemon eucalyptus	Monocyclic monoterpene Hydroxy
α-Thujone	Artemisia	Bicyclic monoterpene Ketone
Myrtenal	Cumin seed	Bicyclic monoterpene Aldehyde
Pinocarveol	Common gum sed	Bicyclic monoterpene Hydroxy
Nerolidol	Neroli	Sesquiterpene Hydroxy
Cedrol	Cedar wood	Sesquiterpene Hydroxy
α-Santonin	Artemisia	Sesquiterpene Ketone
Nootkatone	Grapefruit	Sesquiterpene Ketone
Theaspirane	Wine	Sesquiterpene