α-Amylase and α-Glucosidase Inhibitory Activities of Chemical Constituents from Wedelia chinensis (Osbeck.) Merr. Leaves

Table 1

¹H and ¹³C NMR spectroscopic data of 1 and 2 in CD₃OD.

Position	1		2
	δC^a	δH^b mult. (J in Hz)	δC^a	δH^b mult. (J in Hz)
1	35.5, C	—	79.4, C	—
2	37.9, CH2	1.47 dd (3.5, 12.5)	83.3, CH	4.00 dd (6.0, 9.5)
		1.84 t (12.5)
3	75.5, CH	4.60 ddd (3.0, 3.5, 12.5)	37.5, CH2	1.39 dd (6.0, 13.5)
				1.80 m
4	71.6, CH	4.27 dd (1.0, 3.0)	75.4, C	—
5	69.4, C	—	29.2, CH2	1.53 ddd (4.5, 9.5, 13.5)
				1.66 m
6	71.3, C	—	30.5, CH2	1.93 ddd (4.0, 11.5, 13.5)
				2.09 ddd (4.0, 7.5, 13.5)
7	125.6, CH	5.92 dd (1.0, 16.5)	36.0, CH2	1.76 ddd (4.0, 8.0, 12.5)
				2.22 ddd (8.0, 9.5, 12.5)
8	139.3, CH	5.69 dd (6.0, 16.5)	66.4, CH2	3.95 ddd (3.0, 8.0, 9.5)
				4.05 dd (8.0, 8.5)
9	68.5, CH	4.31 dd (6.0, 12.5)	74.3, CH	3.51 q (6.5)
10	23.7, CH3	1.24 d (6.0)	17.0, CH3	1.15 d (6.5)
11	24.8, CH3	1.03 s	—	—
12	29.5, CH3	1.13 s	—	—
13	17.1, CH3	1.28 s	—	—

^a125 MHz; ^b500 MHz. Assignments were made using the HMQC, HMBC, COSY, and NOESY spectra.