prov:value
| - ogen atom or a methyl group, X is an oxygen atom or an imino group, A is a phenylene group or an alkylene group with one to four, preferably one to two carbon atoms, n is an integer from I to 4, preferably 1 or 2, and m is l, or may be when X is an imino group, and may further comprise, in a statistical distribution, recurrent structural units of the formula wherein a.
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