(15S)-hydroxy-(5Z,8Z,11Z,13E)-eicosatetraenoate + A + H2O => (15S)-hydroperoxy-(5Z,8Z,11Z,13E)-eicosatetraenoate + AH2
(15s)-hydroxy-(5z,8z,11z,13e)-eicosatetraenoate + a + h2o => (15s)-hydroperoxy-(5z,8z,11z,13e)-eicosatetraenoate + ah2