¹H NMR data (400 MHz) of compounds 1–4 and 11^a.

Position	1b	2b	3b	4c	11d
1	6.78 s	6.89 s	6.89 s	6.92 s	6.68 s
4	6.58 s	6.68 s	6.79 s	6.93 s	6.63 s
5	2.68 m	2.71 m	2.64f	2.69f	2.54f
	3.18 m	3.14e	3.08f	3.07 m	2.89 m
6	2.68 m	2.63 m	2.62f	2.64f	2.42f
	3.21 m	3.15e	3.15f	3.20 m	3.08f
8	3.59 d (15.7)	3.51 d (15.7)	3.54 d (15.9)	3.35 d (15.6)	3.35e
	4.22 d (15.7)	4.17 d (15.7)	4.18 d (15.9)	4.19 d (15.6)	4.02 d (15.7)
11	6.90 d (8.8)	6.86 d (8.4)	6.88 d (9.2)	6.72 d (8.2)	6.67 d (8.2)
12	6.88 d (8.8)	6.86 d (8.4)	6.88 d (9.2)	6.80 d (8.2)	6.71 d (8.2)
13	2.90 dd (16.4, 12.2)	2.85 dd (16.1, 11.2)	2.90 dd (16.1, 11.3)	2.73 dd (16.1, 11.0)	2.50 dd (15.7, 12.3)
	3.28 dd (16.4, 3.2)	3.23 dd (16.1, 3.4)	3.27 dd (16.1, 3.5)	3.41 dd (16.1, 3.5)	3.14 dd (15.7, 3.4)
13a	3.64f	3.55 dd (11.2, 3.4)	3.60 dd (11.3, 3.5)	3.58 dd (11.0, 3.5)	3.34e
2-OCH3			3.82 s	3.86 s
3-OCH3	3.85 s	3.80 s
9-OCH3	3.79 s	3.79 s	3.79 s	3.80 s	3.71 s
10-OCH3					3.73 s
2-OCOCH3		2.29 s
3-OCOCH3			2.29 s
10-OCOCH3	2.30 s	2.30 s	2.31 s
1-OH					8.68 s
2-OH	5.52 s				9.06 s
1′				4.88 d (7.5)
2′				3.45 dd (8.7, 7.5)
3′				3.48 t (8.7)
4′				3.38e
5′				3.38e
6′				3.68 dd (12.1, 5.2)
				3.85 dd (12.1, 1.7)

^aAssignments were based on ¹H–¹H COSY, HMQC, HMBC, and NOESY experiments; chemical shifts (δ) are given in ppm.

^bRecorded in CDCl₃.

^cRecorded in CD₃OD.

^dRecorded in DMSO-d₆.

^eOverlapping signal.

^fPartially overlapping signal.