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93. The experimental results were in good accordance with the ones calculated from the models. Stability of the analytes in standard solutions and processed plant samples was found acceptable up to 14 days of storage at 4 °C. The validation proved also good linearity (r 0.99995), precision (RSD less then 4 %), accuracy (96.8-99.2 %), and sensitivity (LOQs 0.14-0.61 ng; LODs 0.05-0.20 ng) of the method, and its applicability for quantification of six primary coumarins and flavan-3-ols in A. hippocastanum bark was demonstrated for re