prov:value
| - R??? is as aforesaid, R?????? is a divalent hydrocarbon group, r is zero or a whole number between 1 and 6, and d is zero or a whole number, most preferably d is 0, 1 or 2, k is 0, 1, 2 or 3, X may be the same as R??? or a hydrolysable group such as an alkoxy group containing alkyl groups having up to 6 carbon atoms, an epoxy group or a methacryloxy group or a halide.
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