| http://www.w3.org/ns/prov#value | - )2, CH3, CH3 O, OH or a halogen atom, and R3 is a hydrogen atom or a methyl group, k is a positive integer satisfying the expression 0???k+m???10, and n is a real number of 2 to 70, a is an integer of 1 to 4, and b is an integer of 1 to 5. 2.
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