prov:value
| - n the hetero atom is nitrogen, oxygen, sulfur, silicon, or phosphorus, R???3 and R???4 each, independently of the other, is a hydrogen atom, an alkyl group with from 1 to about 10 carbon atoms, or an aryl group with from 6 to about 20 carbon atoms, x??? and z??? each, independently of the other, are integers from 1 to about 15,000, and y??? is an integer of from 1 to about 15,000. 7.
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