| http://www.w3.org/ns/prov#value | - s, preferably methyl; R4 is selected from hydrogen (preferred), methyl and ethyl, X- is an anion such as chloride, bromide, methylsulfate, sulfate, or the like, to provide electrical neutrality; A is selected from C1 -C4 alkoxy, especially ethoxy (i.e., --CH2 CH2 O--), propoxy, butoxy and mixtures thereof; and p is from 2 to about 30, preferably 2 to about 15, most preferably 2 to about 8.
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