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Numbering for the tautomers of warfarin considered in the present work; in parentheses are listed all possible stereoisomers for each tautomer. Tautomers enclosed within the dashed line are closed-form. Circles represent the stereocenters of warfarin, the blue circle determines the warfarin enantiomer (either R or S), and the green one indicates the rest of the stereocenters; red rectangles represent the stereobonds of warfarin.
