prov:value
| - each occurrence of X2 and X3 is independently selected from hydrogen, R6, wherein R6 is a monovalent hydrocarbon group having from 1 to 20 carbon atoms, X1, wherein X1 is independently selected from ???Cl, ???Br, ???OR, ???OR6, and R6C(???O)O???, wherein R6 is a monovalent hydrocarbon group having from 1 to 20 carbon atoms, and ???OSi containing groups that result from the condensation of silanols
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