| http://www.w3.org/ns/prov#value | - Salts may be prepared from the acids or thioacids of general formula I, wherein R1 represents a grouping of the formula: --COOR4 or --COSR4, in which R4 represents a hydrogen atom, by methods known per se, for example by reaction of stoichiometric quantities of an acid or thiocid of general formula I and the appropriate base, e.g. an alkali metal or alkaline earth metal hydroxide or carbonate, amm
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