prov:value
| - wherein R6 represents an alkyl group having from 1 to 4 carbon atoms such as a methyl group, ethyl group, propyl group, butyl group, or the like, or aryl group having from 6 to 18 carbon atoms such as a phenyl group, naphthyl group, or the like, y denotes an integer of from 0 to 200, and R7 represents an alkyl group having from 1 to 4 carbon atoms such as a methyl group, ethyl group, propyl group,
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