Umbellulone

Umbellulone
Names
	IUPAC name 4-Methyl-1-(propan-2-yl)bicyclo[3.1.0]hex-3-en-2-one
	Other names Thujenone; Thujen-2-one; Umbellulon
Identifiers
CAS Number	24545-81-1 ; 546-78-1 (1R,5S) ;
3D model (JSmol)	Interactive image;
ChemSpider	82348;
PubChem CID	91195;
UNII	X5YT6KCX2U ;
CompTox Dashboard (EPA)	DTXSID40871998 ;
	InChI InChI=1S/C10H14O/c1-6(2)10-5-8(10)7(3)4-9(10)11/h4,6,8H,5H2,1-3H3 Key: LTTVJAQLCIHAFV-UHFFFAOYSA-N; InChI=1/C10H14O/c1-6(2)10-5-8(10)7(3)4-9(10)11/h4,6,8H,5H2,1-3H3 Key: LTTVJAQLCIHAFV-UHFFFAOYAU;
	SMILES O=C1\C=C(\C)C2C1(C(C)C)C2;
Properties
Chemical formula	C10H14O
Molar mass	150.221 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Umbellulone is a headache-inducing monoterpene ketone found in the leaves of the tree Umbellularia californica, sometimes known as the "headache tree".

It is hypothesized to cause headaches by influencing the trigeminovascular system via TRPA1.