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![M11521 | 4-[(4-Chloro-3-sulphophenyl)azo]-3-hydroxy-2-naphthoic acid](https://qncdn.chemcd.cn/molcolor/M11521.png "M11521 | 4-[(4-Chloro-3-sulphophenyl)azo]-3-hydroxy-2-naphthoic acid")
