N-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-ethanolamine + reduced [NADPH--hemoprotein reductase] + O2 = N-(5,6-epoxy-8Z,11Z,14Z-eicosatrienoyl)-ethanolamine + oxidized [NADPH--hemoprotein reductase] + H2O + H(+) — reaction