| http://www.w3.org/ns/prov#value | - The reaction can be conveniently carried out by treating the compound of structure 31 with a reagent such as diphenylphosphoryl azide and a base such as a tertiary amine (e.g., diisopropylethylamine) in an inert solvent such as an aromatic hydrocarbon (e.g., benzene).
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