| http://www.w3.org/ns/prov#value | - In view of the chemistry described above, it is obvious that polyethers of general formula R.sub.1 O(CH.sub.2 O)nR.sub.2, in which n is a small number and R.sub.1 and R.sub.2 are hydrogens, alkyl groups, or haloalkyl groups, but both R1 and R 2
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