Virodhamine (O-arachidonoyl ethanolamine; O-AEA) is an endocannabinoid and a nonclassic eicosanoid, derived from arachidonic acid. O-Arachidonoyl ethanolamine is arachidonic acid and ethanolamine joined by an ester linkage, the opposite of the amide linkage found in anandamide. Based on this opposite orientation, the molecule was named virodhamine from the Sanskrit word virodha, which means opposition. It acts as an antagonist of the CB₁ receptor and agonist of the CB₂ receptor. Concentrations of virodhamine in the human hippocampus are similar to those of anandamide, but they are 2- to 9-fold higher in peripheral tissues that express CB₂. Virodhamine lowers body temperature in mice, demonstrating cannabinoid activity in vivo.^[1]

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Virodhamine

Names
Preferred IUPAC name 2-Aminoethyl (5Z,8Z,11Z,14Z)-icosa-5,8,11,14-tetraenoate
Other names O-Arachidonoyl ethanolamine
Identifiers
CAS Number	287937-12-6 N
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL187349 Y
ChemSpider	4650158 Y
ECHA InfoCard	100.158.921
IUPHAR/BPS	5554
PubChem CID	5712057
InChI InChI=1S/C22H37NO2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-22(24)25-21-20-23/h6-7,9-10,12-13,15-16H,2-5,8,11,14,17-21,23H2,1H3/b7-6-,10-9-,13-12-,16-15- Y Key: DLHLOYYQQGSXCC-DOFZRALJSA-N Y InChI=1/C22H37NO2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-22(24)25-21-20-23/h6-7,9-10,12-13,15-16H,2-5,8,11,14,17-21,23H2,1H3/b7-6-,10-9-,13-12-,16-15- Key: DLHLOYYQQGSXCC-DOFZRALJBB
SMILES O=C(OCCN)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC
Properties
Chemical formula	C22H37NO2
Molar mass	347.53468
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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• Anandamide
• Oleamide