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<http://webisa.webdatacommons.org/447314374>	<http://www.w3.org/ns/prov#value>	"Ltd.Mesoionic compounds are known to undergo reactions with activated multiple bonds, e.g. 1,3-dipoles undergo thermally or photochemically initiated 1,3-dipolar cycloaddition reactions with activated double bonds as described in R. Huisgen, Angew." .