1-Naphthalenesulfonicacid, 6-diazo-5,6-dihydro-5-oxo-, 3,4-diester with 2,3,4-trihydroxybenzophenone(7CI,8CI); 1-Naphthalenesulfonic acid, 6-diazo-5,6-dihydro-5-oxo-,4-benzoyl-3-hydroxy-1,2-phenylene ester (9CI)
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