| http://www.w3.org/ns/prov#value | - s a hydride, a halogen, an amide or a hydrocarbyl radical such as an alkyl, aryl, alkenyl, aklyaryl or arylaklyl radical having from 1 to 20 carbon atoms, each Q being the same or different, except that if Q is a hydride only one Q can be hydride and p is the valence of Me minus 2.
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