Table 2.

¹H NMR spectroscopic data (500MHz) for compounds 1–5, (δ in ppm).

Position	1*	2*	3	4	5
	δH (mult, J in [Hz])(a)	δH (mult, J in [Hz])(a)	δH (mult, J in [Hz])(b)	δH (mult, J in [Hz])(b)	δH (mult, J in [Hz])(b)
1-OH			11.52 (s)	11.59 (s)	11.79 (s)
2	6.45 (dd, 8.4, 0.9)	6.43 (dd, 8.5, 1.0)	6.54 (d, 8.7)
3	7.38 (t, 8.3)	7.36 (t, 8.3)	7.36 (d, 8.8)	7.16 (d, 8.4)	7.38 (d, 8.5)
4	6.42 (dd, 8.3, 0.9)	6.43 (dd, 8.0, 1.0)		6.41 (d, 8.4)	6.44 (d, 8.5)
5	4.41 (d, 4.3)	4.41 (d, 4.3)	5.39 (brd, 1.3)	5.51 (d, 1.2)	5.54 (d, 1.5)
6	2.86 (m)	2.95 (m)	2.33 (m)	2.40 (m)	2.38 (m)
7	2.86 (brm) 2.24 (brm)	2.82 (dd, 18.0, 9.4) 2.21 (dd, 18.0, 5.1)	2.43 (m) 2.32 (m)	2.50–2.30 (m)	2.50–2.31 (m)
8-OH			14.08 (s)	14.06 (s)	14.03 (s)
8a	3.02 (d, 18.0) 2.98 (d, 17.5)	3.14 (d, 17.5) 3.03 (d, 17.5)
11	1.22 (d, 6.6)	1.24 (d, 7.0)	0.98 (d, 6.3)	1.04 (brd, 5.8)	1.04 (d, 5.9)
12	3.78 (s)	2.72 (d, 11.8) 3.18 (d, 11.8)	4.26 (d, 12.7) 4.14 (d, 12.7)	4.53 (d, 13.0) 4.28 (d, 13.1)	4.47 (d, 12.8) 4.16 (d, 12.8)
14			1.86 (s)	2.09 (s)	2.08 (s)
16			2.04 (s)	2.08 (s)	2.08 (s)
1′			11.52 (s)	11.36 (s)	11.79 (s)
2′			6.54 (d, 8.7)	6.55 (d, 8.6)
3′			7.36 (d, 8.8)	7.30 (d, 8.5)	7.38 (d, 8.5)
4′					6.44 (d, 8.5)
5′			5.39 (brd, 1.3)	5.33 (d, 1.9)	5.54 (d, 1.5)
6′			2.33 (m)	2.27 (m)	2.38 (m)
7′			2.43 (m) 2.32 (m)	2.50–2.30 (m)	2.50–2.31 (m)
8′-OH			14.08 (s)	14.01 (s)	14.03 (s)
11′			0.98 (d, 6.3)	0.97 (d, 6.5)	1.04 (d, 5.9)
12′			4.26 (d, 12.7) 4.14 (d, 12.7)	4.52 (d, 12.5) 3.84 (d, 12.8)	4.47 (d, 12.8) 4.16 (d, 12.8)
14′			1.86 (s)	1.77 (s)	2.08 (s)
16′			2.04 (s)	2.05 (s)	2.08 (s)

^*Atom numbering according to compounds 3–5 for better comparison;

^aCD₃OD,

^bCDCl₃;

see Supporting Information for NMR spectra. Assignments were supported by 2D HSQC and HMBC experiments