Table 1. In Vitro α-Glucosidase Inhibitory Activities of Biscoumarins 1–16.

compound	IC50 (μM)	compound	IC50 (μM)	compound	IC50 (μM)
1	30.77 ± 1.25	7	3.15 ± 0.31	13	3.80 ± 0.05
2	8.12 ± 0.59	8	1.90 ± 0.14	14	2.38 ± 0.24
3	6.06 ± 0.06	9	14.80 ± 0.32	15	15.23 ± 0.45
4	3.19 ± 0.41	10	3.41 ± 0.17	16	5.10 ± 0.18
5	12.31 ± 0.08	11	2.89 ± 0.25	acarbose	93.63 ± 0.49
6	2.95 ± 0.05	12	4.15 ± 0.06