| http://www.w3.org/ns/prov#value | - d hydrocarbyl radical wherein one or more hydrogen atom is replaced by an electron-withdrawing group such as a halogen atom, or an alkoxide radical, or a C1-C50 hydrocarbyl-substituted metalloid radical wherein the metalloid is selected from the Group IV-A of the Periodic Table of Elements; provided that where any Q is a hydrocarbyl such Q is different from (C5H5-y-xRx);y is 1 and B is a covalen
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