prov:value
| - each occurrence of X1 is independently selected from ???Cl, ???Br, ???OH, ???OR6, and R6C(???O)O???, wherein R6 is a monovalent hydrocarbon group having from 1 to 20 carbon atoms, and includes branched or straight chain alkyl, alkenyl, aryl or aralkyl group, each occurrence of X2 and X3 is independently selected from hydrogen, R6, X1, and ???OSi containing groups that result from the condensation
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