| http://www.w3.org/ns/prov#value | - rlypreferably at least 13, carbon atoms.R in the formulae is hydrogen or a C.sub.1-C.sub.18-alkyl radical, preferably a C.sub.1-C.sub.10-alkyl radical, particularly preferably a C.sub.1-C.sub.6-alkyl radical, for example methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl,tert-butyl, n-pentyl(n-amyl), 2-pentyl(sec-amyl), 3-pentyl, 2,2-dimethylprop-1-yl(neopentyl) and n-hexyl, very particularly
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