| http://www.w3.org/ns/prov#value | - other heteroatom linkages in the groups between the alkoxy silane groups; vinyl; acetylenyl; carbonyl; amino; alkyl, aralkyl, or aryl substituted amino; ureido; thiocyanate; thiourea; epoxy; hydrogen; and the like; and a is an integer and is 0, 1, or 2.
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