| http://www.w3.org/ns/prov#value | - Thus, according to a first aspect, the present invention provides a process for the preparation of monoesters or diesters of 9,10-endoethano-9,10-dihydroanthracene-11,11-dicarboxylic acid of the following formula (II): ##STR3## in which R1 and R2 can be identical or different and can represent H, an alkali metal or alkaline earth metal atom, especially sodium or potassium, a linear or branched alk
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