Table 2.

¹H NMR (CD₃OD, 600 MHz) and ¹³C NMR (CD₃OD, 151 MHz) spectral data of compound 2

Position	δH (ppm)	δc (ppm)	COSY	HSQC	HMBC
2	–	168.9	–	–	–
3	–	138.5	–	–	–
4	–	173.8	–	–	–
5	–	162.9	–	–	–
6	–	123.0	–	–	–
7	6.83 (1H, d, J = 8.6 Hz)	114.3	H-8	114.3	C-5, C-6, C-8
8	7.89 (1H, d, J = 8.7 Hz)	131.4	H-7	131.4	C-2, C-7, C-9, C-10
9	–	161.8	–	–	–
10	–	113.3	–	–	–
1’	–	122.1	–	–	–
2’	–	147.5	–	–	–
3’	–	128.5	–	–	–
4’	–	138.5	–	–	–
5’	–	128.5	–	–	–
6’	–	147.5	–	–	–