| http://www.w3.org/ns/prov#value | - carbon atoms, most preferably methyl. R.sub.3 and R.sub.4 are preferably the same and most preferably either methyl or --C.sub.2 H.sub.4 O).sub.n H wherein n is a number of 5 to 15. Examples of suitable anions X include halide, e.g. chloride, iodide,or
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