| http://www.w3.org/ns/prov#value | - (8) [--Si(R11)(B3 --O--]b ; in which each of R1 and R2 independently is a monovalent group selected from the group consisting of hydrogen, alkyl, cycloalkyl, aryl, and heterocyclic groups, each of which, except for hydrogen, may be substituted or unsubstituted; each of R3 -R5, inclusive, independently is a monovalent group selected from the group consisting of alkyl, cycloalkyl, aryl, and heterocy
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