prov:value
| - (wherein, R1 is a hydrogen atom, a fluorine atom, a hydroxy group or a substituent having 1 to 6 carbon atoms which may contain O, S, P, F and Si, R2 represents a direct bond or a divalent linking group composed of 0 to 6 carbon atoms which may contain O, N, S, P, F and Si, and b is an average substituent number and represents a positive number of 0 to 4),
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