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