prov:value
| - (4) (R3)(R4)(R5)Si--, (5) (R6)(R7)(R8)Si--O--, (6) [--Si(R9)(R10)--O--]c, (7) [--Si(R11)(B3)--O--]d ; (8) 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, ma
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