| http://www.w3.org/ns/prov#value | - The reaction for introducing a compound of the general formula (212) to a compound of the general formula (213) can be carried out by treating the former in a suitable solvent, for example water, a lower alcohol such as methanol, ethanol or isopropanol; an ether such as dioxane or tetrahydrofuran; or acetic acid; or a mixed solvent thereof, in the presence of a catalytic reduction catalyst such as
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