prov:value
| - e, the salt is preferably chosen from the compounds for which the cation is ammonium or a cation derived from a metal, in particular of lithium or potassium, zinc, calcium or rare earth metals, or an organic cation, such as a substituted ammonium, an imidazolium, a triazolium, a pyridinium or a 4-(dimethylamino)pyridinium, the said cations optionally carrying a substituent on the carbon atoms of t
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