label: (11S,12S)-dihydroxy-(5Z,8Z,14Z)-eicosatrienoate => (11R,12S)-epoxy-(5Z,8Z,14Z)-eicosatrienoate + H2O
label_lc: (11s,12s)-dihydroxy-(5z,8z,14z)-eicosatrienoate => (11r,12s)-epoxy-(5z,8z,14z)-eicosatrienoate + h2o