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2 Ling-Ling Liang, Jian-She Zhao and Seik Weng Ng .
4-Hydroxy-1-oxo-1,2-dihydrophthalazine-6,7-dicarboxylic acid dihydrate , Acta Cryst (2008). E64, o1225Â Â A. C. Benniston, D. S. Yufit and J. A. K. Howard.
Bis(hydrazinium) 4-hydroxy-1-oxo-2H-phthalazine-6,7-dicarboxylate, Acta Cryst. (1999). C55, 1535-1536Â Â Â Â