Hi All, Using MarvinSketch v5.3.3 (ChemAxon software), the predicted pKa value of the acidic hydrogen on the thiazolidinedione ring of pioglitazone is 4.57 (see attached "Figure_1.gif"). Therefore, the predominant species at pH 7.0 predicted by MarvinSketch is the one depicted in "Figure_2.gif". The different tautomeric forms predicted by MarvinSketch are shown in "Figure_3.gif".
Can anyone explain where these predictions come from, and if they are correct? Thanks, Nancy
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<<attachment: Figure_2.gif>>
<<attachment: Figure_3.gif>>
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