| http://www.w3.org/ns/prov#value | - In the case of reactions carried out on compounds of formula (IV) in which R.sup.8 and R.sup.8a arecarboxyl blocking groups the 3-pyridiniummethyl product will be formed as the corresponding halide salt which may, if desired, be subjected to one or more ion exchange reactions to obtain a salt having the desired anion.When using compounds of formula (IV) in which X is a halogen atom as described ab
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