SEARCH Articles Figures Tables Epoxidation isotope labeling experiment Isotope experiment Isotope isotopic labeling Isotope label Isotope-labeling experiments Isotope-labeling experiments, amine Isotope-labelled Isotopic experiments Isotopic labeling Isotopic labeling cross-over experiments Isotopic labelled Isotopic labelling Isotopic labels Isotopical labeling Labeling experiments Labelling experiments