| http://www.w3.org/ns/prov#value | - oup; each of R6 and R7 is hydrocarbon group with 1-12 carbon atoms; each of a and c is an integer of 1-20; and b is an integer of 10-100. [0113] wherein, R1 is hydrogen or methyl group; each of R2, R3, R4 and R5 is methyl or trimethylsiloxy group; each of R6 and R7 is a hydrocarbon group with 1-12 carbon atoms; each of a and c is an integer of 1-20; p is an integer of 0-20; b is an integer of 10-1
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