| http://www.w3.org/ns/prov#value | - Alternatively, compounds of the invention having the formula (I) can be prepared by methylation of oximes of formula (VII) using a methylating agent such as a methyl halide (methyl iodide, methyl bromide or methyl chloride) or dimethylsulphate, usually in the presence of a base such as sodium methoxide or potassium carbonate (see, for example, H S Anker and H T Clarke, Organic Synthesis, Collectiv
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