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wherein l is 0 to 2, m is 1 to 3, n is 1 to 3, 1+m+n is 3 to 4, positions of the substituent groups are 4- or 4???-positions, M is an alkali metal or ammonium, R1 and R2 are, independently of each other, any one of a hydrogen atom, a sulfonic acid group and a carboxyl group (with the proviso that R1 and R2 are not hydrogen atoms at the same time), and Y is any one of a chlorine atom, a hydroxyl gr
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