prov:value
| - wherein each R3 is a hydrogen atom or an alkyl group of from 1 to 4 carbon atoms, e.g., methyl; X is a halogen atom, e.g., chlorine; a is an integer of from 0 to 4, e.g., 0 to 1, representing the number of halogen atoms substituted on the benzene ring; and k and m are numbers of from 0 to 20, e.g., 1 to 15, or 2 to 10.
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