Table 2.

¹H, ¹³C NMR, and HMBC data of compound 2 (400 MHz, 100 MHz; CD₃OD).

Position	δC	δH (J in Hz)	HMBC
2	78.5
3a	43.0	1.87 (dd, J = 13.4, 9.8, 1H, Ha-3)	C-2,4,10,2′,3′
b		2.24 (dd, J = 13.4, 6.1, 1H, Hb-3)
4	63.5	4.96–4.86 (m, 1H)	C-3,9,10
5	132.4	8.07 (s, 1H)	C-4,6,7,9,10,1′
6	131.5
7	131.0	7.73 (dd, J = 8.5, 1.9, 1H)	C-6,9,1′
8	119.0	6.90 (d, J = 8.5, 1H)	C-6,7,9,10
9	160.6
10	127.2
1′	193.1	9.84 (s, 1H)	C-5,6,7
2′	29.7	1.48 (s, 3H)	C-2,3,3′
3′	26.1	1.36 (s, 3H)	C-2,3,2′