(2R,3S)-tartrate => trans-2,3-epoxysuccinate + H2O
(2r,3s)-tartrate => trans-2,3-epoxysuccinate + h2o
(2R,3S)-tartrate => trans-2,3-epoxysuccinate + H2O
(2r,3s)-tartrate => trans-2,3-epoxysuccinate + h2o