| http://www.w3.org/ns/prov#value | - selected from R.sup.4, and optionally contains a double bond; each X and X.sup.1 is a linker independently selected from --O-Z-, --O-Z-O-Z-, --C(O)O-Z-, --OC(O)-Z-, --S-Z-, --SO-Z-, --SO.sub.2-Z-, --N(R.sup.6)-Z-, --N(R.sup.6)SO.sub.2-Z-,
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