| http://www.w3.org/ns/prov#value | - Examples of X2 include radicals of formula --(X4)n --X5 wherein X4 is C1-6 alkylene; C1-6 alkylene optionally attached to the carbon atom by an oxygen atom or --NH-- or phenyl-C1-3 alkyl; n is 0 or 1 and X5 is --NCS, --NCO, or a carboxy group or a functional derivative thereof, e.g. acid halide, anhydride or hydrazide.
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