| http://www.w3.org/ns/prov#value | - ach R4, R5, and R6 is independently chosen from alkyl groups comprising 1 to 18 carbon atoms and benzyl radicals; each R1 and R2 is independently chosen from hydrogen and alkyl groups comprising 1 to 6 carbon atoms; and each X??? is independently chosen from methyl sulphate anions and halide anions, such as chloride or bromide anions.
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