| http://www.w3.org/ns/prov#value | - R.sub.1 is an alkylene group or an arylalkylene group, and X is (a) a hydrogen atom, (b) a group of the formula ##STR00009## wherein R.sub.2 is an alkyl group, an aryl group, an arylalkyl group, or an alkylaryl group, (c) an alkyleneoxy, aryleneoxy,
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