| http://www.w3.org/ns/prov#value | - The N2 -arylsulfonyl-L-arginyl halide (IX) starting materials required for the condensation reaction can be prepared by reacting an N2 -arylsulfonyl-L-arginine with at least an equimolar amount of a halogenating agent such as thionyl chloride, phosphorus oxychloride, phosphorus trichloride, phosphorus pentachloride or phosphorus tribromide.
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