| http://www.w3.org/ns/prov#value | - the class consisting of divalent radicals of the formulae: ##STR19## where q is 0 or 1, and y is a whole number from 1 to 5; and R is a divalent organic radical selected from the class consisting of (1) aromatic hydrocarbon radicals having from 6-20 carbon atoms and halogenated derivatives thereof, (2) alkylene radicals and cycloalkylene radicals having from 2-20 carbon atoms, C.sub.(2-8) alkylene
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