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process for the production of 4,4 '- dioxy - diphenyl - chinolyl - methanen or 4,4 '- dioxy - diphenyl - isochinolyl - methanen or their äthern or esters
process for the production of 4,4 '- dioxy - diphenyl - chinolyl - methanen or 4,4 '- dioxy - diphenyl - isochinolyl - methanen or their äthern or esters