TABLE 4.

¹H (600 MHz) and ¹³C (150 MHz) NMR data of compound 2 (DMSO-d₆, J in Hz)

Position	δC, type	δH	HMBC
1	151.30, C
2	113.57, C
3	147.49, C
4	108.25, CH	7.34 (d, J = 1.2 Hz, 1H)	C-6, C-3, C-1, C-8
5	123.28, C
6	124.83, CH	7.55 (dd, J = 1.8, 8.4 Hz, 1H)	C-7, C-4, C-1, C-8
7	107.97, CH	6.99 (d, J = 7.8 Hz, 1H)	C-5, C-3, C-1
8	165.56, C
9	52.01, CH3	3.80 (s, 3H)	C-8
10	167.36, C
11	21.85, CH3	1.80 (s, 3H)	C-10, C-2