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A process for the preparation of readily water-soluble derivatives of the diphenol condensation products of the dike todi hydro benzo pyrrole - and / or the dike todi hydro benzo furan series
A process for the preparation of readily water-soluble derivatives of the diphenol condensation products of the dike todi hydro benzo pyrrole - and / or the dike todi hydro benzo furan series