| http://www.w3.org/ns/prov#value | - herein R is preferably a linear alkyl group having 8 to 30 carbon atoms, particularly preferably 8 to 18 carbon atoms, z=0 or 1 to 12, particularly preferably 3, and X is a sodium, potassium, magnesium, zinc, ammonium ion or a monoalkanol-, dialkanol- or trialkanolammonium ion having 2 to 4 carbon atoms in the alkanol groups, wherein a particularly preferred example is zinc cocoyl ether sulfate ha
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