| http://www.w3.org/ns/prov#value | - wherein R1 and R2, which may be the same or different, and each represents a hydrocarbon group having usually from 1 to 15 carbon atoms, preferably from 1 to 4 carbon atoms, X is a halogen atom, m is 0???m???3, n is 0???n<3, p is 0???p<3, q is 0???q<3, and m+n+p+q=3; and
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