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New couplers 6 - alkoxy - 2,3 - diaminopyridine, the amino radical in position 2 is an amino radical disubstituted and use of these couplers for dyeing fibers subject-matter
New couplers 6 - alkoxy - 2,3 - diaminopyridine, the amino radical in position 2 is an amino radical disubstituted and use of these couplers for dyeing fibers subject-matter