(9Z,12Z,15Z)-octadecatrienoate + O2 <=> (13R)-hydroperoxy-(9Z,11E,15Z)-octadecatrienoate
(9z,12z,15z)-octadecatrienoate + o2 <=> (13r)-hydroperoxy-(9z,11e,15z)-octadecatrienoate
(9Z,12Z,15Z)-octadecatrienoate + O2 <=> (13R)-hydroperoxy-(9Z,11E,15Z)-octadecatrienoate
(9z,12z,15z)-octadecatrienoate + o2 <=> (13r)-hydroperoxy-(9z,11e,15z)-octadecatrienoate