| http://www.w3.org/ns/prov#value | - ; - aldehyde [-C(=O)H] and haloformyls [-C(=O)X, wherein X is a halogen atom] ; - hydrocarbylketones [-C(=O)-R, where R is a hydrocarbyl group], such as alkylketones, arylketones, alkylarylketones and aralkylketones ; - hydrocarbyloxyhydrocarbylketones [-C(=O)-R 1 -O-R 2 , where R 1 is a divalent hydrocarbon group such as an alkylene, an arylene, an alkylarylene or an aralkylene, preferably a C 1
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