14,15-EE-5 (Z) -E

Epoxyeicosatrienoic acids (EETs), such as 11 (12) -EET and 14 (15) -EET, are cytochrome P450 metabolites of arachidonic acid that have been identified as endothelium-derived hyperpolarizing factors with vasodilator activity. 14,15-EE-5 (Z) -E is a structural analog of 14,15-epoxyeicosatrienoic acids (14,15-EET) that antagonizes EET-induced relaxation of vascular smooth muscle. Relaxation of U46619-constricted bovine arteries by 14,15-EET could be inhibited approximately 80% by 14,15-EE-5 (Z) -E at a concentration of 10 μM. 14,15-EE-5 (Z) -E does not appear to antagonize nitric oxide- or iloprost-mediated vascular relaxation.