2O4Z:
reference: Carbonic anhydrase inhibitors: The X-ray crystal structure of the adduct of N-hydroxysulfamide with isozyme II explains why this new zinc binding function is effective in the design of potent inhibitors., Temperini C, Winum JY, Montero JL, Scozzafava A, Supuran CT, Bioorg Med Chem Lett. 2007 May 15;17(10):2795-801. Epub 2007 Feb 28. PMID: 17346964

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