3.1.1.41 cephalosporin C + H2O = deacetylcephalosporin C + acetate - - 3.1.1.41 cephalosporin C + H2O = deacetylcephalosporin C + acetate a catalytic mechanism in which this Ser hydroxyl rotation prevents reversal of the reaction and allows access of a water molecule for completion of the reaction 730907 3.1.1.41 cephalosporin C + H2O = deacetylcephalosporin C + acetate mechanism 652917