Table 2.

¹H- and ¹³C-NMR spectral data of compounds 9 and 24 [(600/150 MHz, TMS, δ (ppm) (J = Hz)]

Position	9 a		24 b
	δ H	δ C	δ H	δ C
2	–	165.3	–	163.5
3	6.64 (s)	106.08	6.56 (s)	102.6
4	–	183.9	–	181.6
4a	–	105.5	–	103.1
5	–	163.4	–	156.5
6	6.10 (d 2.0)	100.4	–	108.3
7	–	166.4	–	163.9
8	6.34 (d 2.0)	95.3	6.37 (s)	93.6
8a	–	159.6	–	160.7
1′	–	128.1	–	121.4
2′	7.26 (s)	105.3	7.375 (s)	113.1
3′	–	154.8	–	145.8
4′	–	140.7	–	150.0
5′	–	154.8	6.87 (d 8.0)	116.0
6′	7.26 (s)	105.3	7.382 (d 8.0)	118.8
3′,5′-OMe	3.96 (s)	57.1	–
5-OH	–	–	13.55 (br s)
1′′	–	130.9	4.58 (d 9.4)	72.2
2′′	6.81 (s)	106.13	4.60 (m)	78.7
3′′	–	148.9	3.61 (d 5.9)	74.5
4′′	–	136.2	3.80 (m)	68.6
5′′	–	148.9	3.75 (d 11.5)	70.2
			3.52 (d 11.7)
6′′	6.81 (s)	106.13	–	–
7′′	5.17 (d 5.5)	82.0	–	–
8′′	4.55 (m)	86.9	–	–
9′′	3.72 (dd 12.1, 4.3)	61.8	–	–
	3.39 (m)
3′′,5′′-OMe	3.84 (s)	56.9	–	–
1′′′	4.57 (d 7.5)	104.9	4.19 (d 7.7)	104.9
2′′′	4.33 (m)	75.7	2.87 (t 8.3, 8.6)	74.6
3′′′	3.42 (m)	78.2	3.06 (t 8.9)	76.5
4′′′	3.19 (m)	71.5	2.97 (t 8.9, 9.3)	69.8
5′′′	3.37 (m)	77.9	2.70 (t 9.3)	76.2
6′′′	3.75 (dd 11.9, 2.3)	62.6	3.16 (m)	60.8
	3.60 (dd 11.9, 5.3)

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

^ain CD₃OD, 25 °C

^bin DMSO-d ₆, 45 °C