| http://www.w3.org/ns/prov#value | - , in which the R radicals are identical or different optionally hydroxylated hydrocarbon radicals and Y??? is an anion of a strong acid, such as halide, sulphate and sulphonate anions; cetyltrimethylammonium bromide is one of the cationic surfactants which can be used,amine salts of formula N+R???R???R??????, in which the R radicals are identical or different optionally hydroxylated hydrocarbon ra
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