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1. Introducing radioactive isotopes into biological molecules is a common method for tracing the fate of molecules. An effective way to introduce radioactive iodine into proteins and peptides is by the following reaction. The labeled reagent reacts with primary amines to form an amide bond. Amine-containing biomolecule a. Draw the structure of the leaving group b. Draw arrow pushing mechanism of the reaction. c. The reagent is considered an 'active ester'. Explain why this ester is considered 'activated'. Relate your explanation to the specific structure