| http://www.w3.org/ns/prov#value | - s, or an aralkyl group; R5 is a hydrogen atom or a cyano group; R7 is a hydrogen atom, a cyano group or--COOY; Y is a linear, branched or cyclic alkyl group having 1 to 6 carbon atoms; R5 and R7 may bind to each other to form --CO--O--CO; k and l are independently a natural number (0.1???k/(k+l)???0.9); and m is zero or a natural number (when m is a natural number, 0.05???m/(k+l+m)???0.50), (b) a
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