Table 1.

¹H- and ¹³C-NMR spectral data of compounds 6, 7 and 8 [(600/150 MHz, in DMSO-d ₆, 25 °C, TMS, δ (ppm) (J = Hz)]

Position	6		7		8
	δ H	δ C	δ H	δ C	δ H	δ C
2	–	164.1	–	164.0	–	163.9
3	7.07 (s)	103.7	7.06 (s)	103.9	6.96 (s)	103.3
4	–	182.0	–	181.8	–	181.9
4a	–	105.4	–	105.5	–	105.3
5	–	161.0	–	161.2	–	161.1
6	6.52 (d 2.0)	99.4	6.49 (br s)	99.4	6.52 (d 1.9)	99.3
7	–	162.5	–	162.7	–	162.6
8	7.01 (d 2.0)	95.7	6.86 (br s)	95.2	6.85 (d 1.9)	95.1
8a	–	156.7	–	156.9	–	156.6
1′	–	120.1	–	120.2	–	119.8
2′	7.37 (s)	104.7	7.37 (s)	104.6	7.28 (s)	104.3
3′	–	148.1	–	148.2	–	148.0
4′	–	140.0	–	140.0	–	140.1
5′	–	148.1	–	148.2	–	148.0
6′	7.37 (s)	104.7	7.37 (s)	104.6	7.28 (s)	104.3
3′,5′-OMe	3.89 (s)	56.3	3.89 (s)	56.4	3.88 (s)	56.2
5-OH	12.97 (br s)	–	13.05 (br s)	–	13.01 (br s)	–
1′′	5.33 (d 5.7)	98.3	5.10 (d 7.4)	99.7	5.15 (d 7.3)	99.5
2′′	3.55 (m)	82.5	3.30 (m)	73.0	3.32 (m)	72.9
3′′	3.19 (m)	77.0	3.32 (m)	76.1	3.37 (m)	76.2
4′′	3.44 (m)	70.9	3.17 (m)	69.6	3.26 (m)	70.0
5′′	3.98 (m)	74.6	3.75 (m)	73.8	3.82 (m)	73.7
6′′	–	170.0	4.34 (d 11.6)	63.8	4.57 (d 11.9)	63.2
			4.15 (dd 11.9, 6.5)		4.10 (dd 11.9, 7.3)
1′′′	4.48 (d 7.9)	104.7	–	167.4	–	124.1
2′′′	2.99 (m)	74.6	3.27 (s)	42.3	6.80 (s)	105.7
3′′′	3.16 (m)	76.1	–	167.7	–	147.8
4′′′	3.10 (m)	69.6	–	–	–	138.1
5′′′	3.55 (m)	75.0	–	–	–	147.8
6′′′	3.53 (m)	60.6	–	–	6.80 (s)	105.7
	3.44 (m)
7′′′	–	–	–	–	7.47 (d 15.9)	145.4
8′′′	–	–	–	–	6.44 (d 15.9)	114.3
9′′′	–	–	–	–	–	166.2
3′′′,5′′′-OMe	–	–	–	–	3.71 (s)	55.7

s Singlet, m multilet, d doublet, dd double doublet, br s broad singlet