prov:value
| - 60??? wherein R50 and R60 each, independently of the other, is a hydrogen atom, an alkyl group, an aryl group, an arylalkyl group, or an alkylaryl group, and R10 and R11 each, independently of the other, is (i) an alkylene group, (ii) an arylene group, (iii) an arylalkylene group, or (iv) an alkylarylene group, and wherein R10 can also be (v) a polyalkyleneoxy group, (vi) a polyaryleneoxy group, (
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