3F4X:
reference: Carbonic anhydrase inhibitors. Comparison of chlorthalidone and indapamide X-ray crystal structures in adducts with isozyme II: when three water molecules and the keto-enol tautomerism make the difference., Temperini C, Cecchi A, Scozzafava A, Supuran CT, J Med Chem. 2009 Jan 22;52(2):322-8. PMID: 19115843

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