prov:value
| - n atom, an alkyl group, a substituted or unsubstituted aromatic ring, or a substituted or unsubstituted heterocyclic ring; each of R5 and R6 is a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an alkoxy group, a substituted or unsubstituted aromatic ring, or a substituted or unsubstituted heterocyclic ring; and m denotes an integer of from 2 to 3,000.
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