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Sixteen compounds ( 1 - 16 ) were isolated from  Impatiens chapaensis . Chemical structures were determined by spectroscopic analyses and comparisons with previously published data. This report is the first to identify compounds  1 ,  5–7 ,  10 ,  12–14 , and  16  from the genus  Impatiens.  Seven chosen isolates ( 5 ,  7 ,  10 ,  11 ,  12 ,  15 , and  16 ) were submitted for  α -glucosidase inhibition assays with acarbose as the positive control (IC 50  = 227.14 ± 13.71 µM). Flavonoid  5  exhibited a significant inhibitory effect (IC 50  = 101.00 ± 9.01 µM).

Chemical constituents of Impatiens chapaensis Tard. and their α -glucosidase inhibition activities