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process for the production of the new 5,7,9,12,13,15 - trioxatridecan - 1.13 - disäure bis (3 '- carboxy - (2', 4 ', 6' - trijodanilides) and its salts
process for the production of the new 5,7,9,12,13,15 - trioxatridecan - 1.13 - disäure bis (3 '- carboxy - (2', 4 ', 6' - trijodanilides) and its salts