In order to clarify the structural difference between active pinacidil-type potassium channel openers and a less active one, the tautomerisms of pinacidil derivatives 1-3 were investigated by NMR spectrometries. The predominant tautomer of the less active compound 3 was different from those of the active compounds 1 and 2.
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The corresponding record at NLM can be accessed at https://www.ncbi.nlm.nih.gov/pubmed/11078201