| http://www.w3.org/ns/prov#value | - wherein each R1, R2 and R3 is selected from hydrogen, ???CH3, ???Si(R6)p, ???OSi(R5)p, ???R5Si(R5)p, or ???R5OSi(R5)p, wherein at least one of R1, R2 and R3 is ???Si(R6)p, ???OSi(R5)p, ???R5Si(R5)p or ???R5OSi(R5)p, and p is an integer of 1 to 3;
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