Table 3. NMR spectroscopic data for compound 6 (500 MHz for ¹H and 125 MHz for ¹³C).

Position	6 (in DMSO-d6)
	δ C, type	δ H mult. (J in Hz)
1	164.3, C	—
2	112.0, CH	6.50 d (0.5)
3	148.9, C	—
4	110.2, CH	6.37 d (0.5)
4a	161.4, C	—
6	67.4, CH2	(a) 5.39 d (13.4)
		(b) 5.13 d (13.4)
6a	132.8, C	—
7	133.8, C	—
8	158.1, C	—
9	101.4, CH	6.66 s
10	159.7, C	—
10a	114.9, C	—
11	194.6, C	—
11a	110.7, C	—
12	21.3, CH3	2.25 s
1-OH	—	13.18 br s
8-OMe	56.3, CH3	3.87 s
10-OH	—	11.22 br s
1′	103.6, CH	4.50 d (7.8)
2′	73.9, CH	3.25 ddd (8.5, 7.8, 4.5)
3′	76.2, CH	3.20 ddd (8.8, 8.5, 4.3)
4′	69.8, CH	3.12 ddd (9.1, 8.8, 5.0)
5′	76.8, CH	3.00 ddd (9.1, 5.8, 2.1)
6′	60.9, CH2	(a) 3.57 ddd (11.5, 5.9, 2.1)
		(b) 3.40 ddd (11.5, 5.9, 5.8)
2′-OH	—	5.20 d (4.5)
3′-OH	—	5.04 d (4.3)
4′-OH	—	4.96 d (5.0)
6′-OH	—	4.15 t (5.9)