| http://www.w3.org/ns/prov#value | - Preferred W groups are upper halo, i.e., halogens other than fluoro (chloro, bromo or iodo), or sulfonic ester such as aryl sulfate, e.g., tosylate, brosylate or nosylate, alkyl sulfonate, e.g., mesylate and fluoroalkyl sulfonate, for example triflate or nonaflate.
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