| http://www.w3.org/ns/prov#value | - A process for preparing the compounds I as claimed in claim 1, where R4 is not hydrogen and X is a direct bond or oxygen, which comprises reacting a corresponding compound of the formula I where R4 is hydrogen with a compound L3 --R4 where L3 is a nucleophilically replaceable group and R4 is not hydrogen. 5.
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