prov:value
| - ps, R5 is a hydrogen atom or an alkyl group, R6 is an aryl group, R2 and R4 each, independently of the other, are (OCnH2n) or (CnH2nO), wherein within each of R2 and R4 n has an average value of from 2 to 3, u and z each, independently of the other, are integers of from 1 to about 15,000, y is an integer of from 1 to about 15,000, x is an integer of from 1 to about 15,000, and a and b each, indepe
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