¹H NMR data (400 MHz) of compounds 5–9^a.

Position	5b	6b	7b	8c	9b
3	6.50 s	7.08 s	7.07 s		6.91 s
4	2.68d	2.94 dd (14.9, 2.5)	7.76 d (5.2)	7.82 s	2.73e
	3.14d	3.22e			2.86e
5	2.64d	3.20e	8.56 d (5.2)		3.27e
	3.09d	3.59 brdd (12.6, 5.3)			4.12 brdd (13.2, 2.0)
6a	3.20 dd (14.1, 4.5)	4.11 dd (13.9, 4.3)			4.97 dd (13.8, 3.8)
7	2.19 dd (14.5, 14.1)	2.87 dd (13.9, 13.8)			2.79 t (13.8)
	3.69 dd (14.5, 4.5)	3.03 dd (13.8, 4.3)			2.96 dd (13.8, 3.8)
8		7.31 dd (7.1, 1.2)		8.03 s	7.25–7.32e
9		7.26 ddd (7.5, 7.1, 1.2)			7.25–7.32e
10	6.71 d (8.4)	7.32 ddd (7.6, 7.5, 1.2)	7.15 d (8.8)	7.30 d (9.0)	7.25–7.32e
11	7.46 d (8.4)	8.33 brd (7.6)	8.19 d (8.8)	8.66 d (9.0)	8.30 brd (7.7)
OCH2O	5.88 d (1.1)
6.02 d (1.1)		6.28 s	6.40 s
1-OCH3		3.72 s			3.53 s
3-OCH3				4.03 s
5-OCH3				3.82 s
8-OCH3			3.92 s
9-OCH3				4.03 s
2-OCOCH3					2.32 s
N–CH3	2.64 s
N–COCH3					2.21 s
1′		4.96 d (7.6)
2′		3.54 dd (8.9, 7.6)
3′		3.48 t (8.9)
4′		3.38 dd (8.9, 8.6)
5′		3.48 brdd (8.6, 6.0)
6′		3.69 dd (12.0, 6.0)
		3.92 dd (12.0, 2.1)

^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.

^dOverlapping signal.

^ePartially overlapping signal.