prov:value
| - where the groups R are identical or different and R is methyl, ethyl, n-propyl, isopropyl, 2-methoxyethyl, or hydrogen, R3 is a phenyl group, each of c and c???, independently, is an integer from 2 to 50, preferably from 3 to 15, where the siloxanes may be present in the form of linear, branched, or cyclic moieties.
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