| http://www.w3.org/ns/prov#value | - m and n are integers and their sum is???20, preferably???50, R1, R2, R3, R4 and R5 are independently alkyl, aryl, alkylaryl or their heteroatom derivatives thereof, preferably having 1???12 carbon atoms, substituted or unsubstituted alkylsilyl derivatives; and R??? is a linking group such as alkylene, cycloalkylene or phenylene.
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