(2R)-hydroxybutanoyl-CoA => (2E)-butenoyl-CoA + H2O
(2r)-hydroxybutanoyl-coa => (2e)-butenoyl-coa + h2o
(2R)-hydroxybutanoyl-CoA => (2E)-butenoyl-CoA + H2O
(2r)-hydroxybutanoyl-coa => (2e)-butenoyl-coa + h2o