prov:value
| - ygen atom or ##STR11## group where R is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; Y and Z represent a hydrogen atom or a hydroxy group, with the proviso that at least Y or Z is a hydroxy group, (a), (b), (c), (d), and (e) represent the average repeat units in the polymer backbone; (a), (b), (c), and (d) are numbers up to 10; and (a), (b), and (c) each must be at least 1; (e) is
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