A cytochrome P450 monooxygenase that selectively catalyzes the epoxidation of the last double bond of the arachidonoyl moiety of anandamide, potentially modulating endocannabinoid signaling. Has no hydroxylase activity toward various fatty acids, steroids and prostaglandins. Mechanistically, uses molecular oxygen inserting one oxygen atom into a substrate, and reducing the second into a water molecule, with two electrons provided by NADPH via cytochrome P450 reductase (CPR; NADPH-ferrihemoprotein reductase). N-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-ethanolamine + O2 + reduced [NADPH--hemoprotein reductase] = H(+) + H2O + N-(14,15-epoxy-5Z,8Z,11Z-eicosatrienoyl)-ethanolamine + oxidized [NADPH--hemoprotein reductase] Expressed in brain and aorta. In the brain, expressed in the Purkinje cells of the cerebellum, pyramidal neurons in the dentate gyrus of the hippocampus, cortical forebrain neurons and those of brain stem nuclei (at protein level). In addition to neurons, also expressed in cerebral vascular endothelial cells (at protein level). Also expressed in epithelial cells of the choroid plexus (at protein level). Hardly detectable in heart, lung, kidney and spleen. Belongs to the cytochrome P450 family.