Table 3.

α-Glucosidase inhibitory activity of 1a/1b−4a/4b and 5.

Compound	α-glucosidase inhibitory activity (IC50, μM)
1a	45.4 ± 3.8
1b	53.1 ± 1.4
2a	17.3 ± 2.4
2b	19.2 ± 1.9
3a	52.2 ± 4.6
3b	49.8 ± 5.7
4a	15.7 ± 1.1
4b	18.9 ± 2.3
5	48.9 ± 7.3
acarbose	154.7 ± 8.1