| http://www.w3.org/ns/prov#value | - or --S--, n has a value of from 1 to 6, Z' is ##STR7## Z is ##STR8## Z' is selected from the group consisting of HSR--, HSCH2 CH2 NGR-- and HOCH2 CH2 SR-- radicals, each G is R-- or H--, D is a divalent or trivalent radical capable of being hydrolyzed to release said endblocking silyl unit, q has a value of 2 when D is a divalent radical and q has a value of 3 when D is a trivalent radical,
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