Cassane diterpenoids from the seeds of Caesalpinia bonduc and their nitric oxide production and α-glucosidase inhibitory activities Author Tu, Wen-Chao , Lin-Fen Ding &, Liu-Dong Song & **, & * & State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China Author Ding, Lin-Fen Author Peng, Li-Yan Author Song, Liu-Dong Author Wu, Xing-De Author Zhao, Qin-Shi text Phytochemistry 2022 112973 2022-01-31 193 112973 112973 http://dx.doi.org/10.1016/j.phytochem.2021.112973 journal article 10.1016/j.phytochem.2021.112973 1873-3700 8167921

Table 3 1 H NMR spectroscopic data of compounds 7–12 in CDCl (δ in ppm, J in Hz). 3 H

No.	7 a	8 a	9 a	10b	11 a	12 a
a Measured at 500 MHz. b Measured at 600 MHz.
1		4.92 br s	4.85 t	3.81 t	5.85	5.66 t
			(2.3)	(2.7)	d (2.7)	(2.9)
2 α	2.17 dt	1.76	1.74			2.11 m
	(13.2,	overlap	overlap
5.2)
2 β	2.89 td	1.96 m	1.96 m	5.28	5.46 ddd	1.96
	(13.2,			ddd	(13.1,	overlap
	5.2)			(13.0,	4.6, 2.7)
				4.9, 2.7)
3 α	1.91 td	1.75	1.73	2.02 t	2.17 t	1.97
	(13.2,	overlap	overlap	(13.0)	(13.1)	overlap
5.2)
3 β	1.68 dt	1.17 m	1.11 dt	1.38 dd	1.41 dd	1.21 m
	(13.2,		(15.2,	(13.0,	(13.1,
	5.2)		6.2, 3.7)	4.9)	4.6)
6 α		2.17 dd			2.00
		(10.8,			overlap
		6.2)
6 β	5.59 br s	1.72 t	3.81	3.92 t	2.00	5.73 dd
		(10.8)	d (10.1)	(9.5)	overlap	(9.1,
						7.5)
7 α	5.78 br s	4.40 td	3.74 t	5.23 dd	2.75 dt	2.87 dd
		(10.8,	(10.1)	(10.7,	(17.1,	(16.5,
		6.2)		9.5)	9.6)	9.1)
7 β					2.66 dd	3.30 dd
					(17.1,	(16.5,
					7.2)	7.5)
8	1.96	1.84 dd	2.34 ddd	2.57
	overlap	(12.0,	(11.8,	ddd
		10.8)	10.1, 8.2)	(12.6,
				10.7,
				8.6)
9	3.00 td	2.82 ddd	2.61 td	2.94 td
	(11.6,	(12.0,	(11.8,	(12.6,
	4.1)	10.7, 7.0)	5.7)	5.5)
11 α	3.09 dd	2.37 m	2.27 dd	2.78 dd	6.37 s	7.03 s
	(15.7,	(2H)	(15.8,	(15.2,
	4.1)		5.7)	5.5)
11 β	2.29 dd		2.48 dd	2.48 dd
	(15.7,		(15.8,	(15.2,
	11.6)		11.8)	12.6)
14		2.64 m	3.46	3.42
			d (8.2)	d (8.6)
15	6.39	6.38	6.14	6.12	3.09 t	6.72
	d (1.7)	d (1.9)	d (1.8)	d (1.9)	(8.6, 2H)	d (1.8)
16	7.26	7.31	7.24	7.24	4.49 m	7.53
	d (1.7)	d (1.9)	d (1.8)	d (1.9)	(2H)	d (1.8)
17a	1.38 s	3.94			2.12 s	2.36 s
		d (11.5)
17b		3.74
		d (11.5)
18	1.11 s	1.07 s	1.28 s	1.29 s	1.17 s	1.32 s
19	1.29 s	1.12 s	1.23 s	1.29 s	1.20 s	1.17 s
20	1.52 s	1.14 s	1.18 s	1.20 s	1.41 s	1.44 s
1-OAc		2.07 s	2.10 s		1.99 s	1.95 s
2-OAc				2.11 s	2.02 s
6-OAc	2.05 s					2.20 s
7-OAc	1.96 s			2.05 s
1-OH				2.74
				d (2.7)
5-OH		2.90 br s	2.92 br s	3.88 br s	2.92 br s	3.06 br s
6-OH				2.11
				d (9.5)
-OCH3		3.20 s	3.74 s	3.73 s