prov:value
| - wherein R is an alkoxy group that may be substituted, R1 is a hydrogen atom or an alkyl (such as methyl, ethyl, or propyl) group, n is an integer of 3 to 50, b is an integer of 5 to 150, a and c, the same or different, each is an integer from 0 to 5, such that a+c is an integer from 2 to 5, A is a CH???, CH3C???, CH3CH2C???, or a
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