| http://www.w3.org/ns/prov#value | - The reductive debenzylation of a compound of formula I according to the invention, in which one of the radicals R4, R5 or R6 denotes O-benzyl, can be effected in the presence of platinum or palladium on a support material, for example activated carbon, in the presence of hydrogen in a solvent, for example acetic acid or a C1-4 alkyl alcohol, at pressures between 1 and 100 bar and at temperatures b
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