preferred_name: 5,20-dihydroxy-(6E,8Z,11Z,14Z,17Z)-eicosapentaenoate + oxidized [NADPH--hemoprotein reductase] + H2O + H(+) => 5-hydroxy-(6E,8Z,11Z,14Z,17Z)-eicosapentaenoate + reduced [NADPH--hemoprotein reductase] + O2