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The titration of the (S)‐enantiomer of omeprazole with the (R)‐enantiomer in chloroform‐d1 is monitored by continuous‐flow capillary microcoil 1H NMR spectroscopy employing a microcoil with a detection volume of 1.5 µl. The observed changes of the 1H NMR chemical shifts indicate the formation of a heterochiral (R,S) dimer of omeprazole via its sulfinyl group and the NH group of the benzimidazole ring...
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