(5Z,8Z,11Z,14Z)-eicosatetraenoate + O2 <=> (12S)-hydroperoxy-(5Z,8Z,10E,14Z)-eicosatetraenoate
(5z,8z,11z,14z)-eicosatetraenoate + o2 <=> (12s)-hydroperoxy-(5z,8z,10e,14z)-eicosatetraenoate
(5Z,8Z,11Z,14Z)-eicosatetraenoate + O2 <=> (12S)-hydroperoxy-(5Z,8Z,10E,14Z)-eicosatetraenoate
(5z,8z,11z,14z)-eicosatetraenoate + o2 <=> (12s)-hydroperoxy-(5z,8z,10e,14z)-eicosatetraenoate