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. Author manuscript; available in PMC: 2021 May 1.

Published in final edited form as: Phytochemistry. 2020 Feb 17;173:112278. doi: 10.1016/j.phytochem.2020.112278

Table 2.

¹H NMR (600 MHz) and ¹³C NMR (150 MHz) data for compounds 5-9 in DMSO-d₆.

Pos.	5		6		7		8		9
Pos.	δ_C	δ_H	δ_C	δ_H	δ_C	δ_H	δ_C	δ_H	δ_C	δ_H
1	168.0
2			153.5		158.2		157.0		157.9
3	110.0		102.0	6.27, s	108.1	6.39, s	101.8	6.98, s	103.1	7.05, s
3a	130.1		119.9		143.1		120.2		129.6
4	140.6		192.1		36.4	2.91, m	127.7		119.1
5	151.2		77.1	3.89, dd (4.6, 7.8)	26.7	H_α: 2.10, m	115.3	7.25, s	131.8	7.55, d (8.1)
5	151.2		77.1	3.89, dd (4.6, 7.8)	26.7	H_β: 1.82, m	115.3	7.25, s	131.8	7.55, d (8.1)
6	118.0	7.01, d (7.8)	70.7	3.95, m	36.2	2.43, m	154.6		110.4	6.73, d (8.1)
7	116.6	7.16, d (7.8)	30.4	H_α: 3.15, dd (4.8, 16.8)	184.2		103.6	7.21, s	150.5
7	116.6	7.16, d (7.8)	30.4	H_β: 2.80, dd (7.8, 16.8)	184.2		103.6	7.21, s	150.5
7a	119.5		162.4		145.9		155.7		143.5
8	67.3	4.26, q (6.6)	13.1	2.27, s	13.7	2.34, s	13.8	2.44, s	13.8	2.47, s
9	17.1	1.12, d (6.6)			63.2	H_α: 3.64, m	192.4	10.07, s	189.7	9.83, s
9	17.1	1.12, d (6.6)			63.2	H_β: 3.52, m	192.4	10.07, s	189.7	9.83, s
3-OCH₃	50.8	2.97, s
4-OH		9.39, s
5-OH		10.51, s		5.50, d (4.6)
6-OH				5.44, d (4.2)				^a
7-OH										^a
8-OH		5.63, br s
9-OH						4.87, t (5.4)

^a

Not observed