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 1 1 H NMR spectroscopic data of compounds 1–6 in CDCl (δ in ppm, J in Hz). 3 H

No.	1 a	2 a	3b	4 a	5 a	6 a
a Measured at 500 MHz. b Measured at 600 MHz.
1	5.09 t (3.2)	5.91 d (3.1)	4.57 br s	4.91 t (2.8)	4.84 t (2.7)	4.92 t (2.7)
2 α	1.77 ddd (15.1, 6.4, 3.2)	5.67 t (3.1)	1.96 ddd (13.7, 6.7, 3.4)	1.75 overlap	1.76 ddd (15.2, 6.3, 2.7)	1.74 overlap
2 β	2.12 m		2.22 m	1.93 ddd (15.0, 4.0, 2.8)	1.91 ddd (15.2, 3.8, 2.7)	1.98 m
3 α	1.96 m		1.24 m	1.75 overlap	1.80 m	1.74 overlap
3 β	1.07 dt (13.9, 3.2)	5.22 d (3.1)	2.16 m	1.13 m	1.12 m	1.16 m
6 α		2.02 overlap	2.07 overlap	2.21 dd (11.5, 6.0)		2.22 dd (11.9, 5.8)
6 β	5.62 d (11.0)	2.02 overlap	2.07 overlap	1.57 t (11.5)	5.35 ddd (11.2, 4.8, 1.6)	1.60 t (11.9)
7 α	5.66 t (11.0)	2.78 dt (17.1, 9.5)	2.89 dd (17.6, 8.8)	5.38 td (11.5, 6.0)	2.07 t (11.2)	5.21 td (11.9, 5.8)
7 β		2.66 dd (17.1, 6.0)	2.83 ddd (17.6, 5.8, 3.2)		1.66 dt (11.2, 4.8)
8	2.88 t (11.0)			1.98 m	1.98 m	2.27 m
9	3.42 dd (11.0, 2.0)			2.75 ddd (12.2, 10.8, 6.7)	2.61 td (10.7, 6.6)	2.74 td (11.6, 5.8)
11 α	5.74 d (2.0)	6.33 br s	7.39 br s	2.30 dd (16.4, 6.7)	2.24 (16.3, 6.6)	2.35 dd (16.3, 5.8)
11 β				2.44 dd (16.4, 10.8)	2.33 dd (16.3, 10.7)	2.50 ddd (16.3, 11.6)
14 β				2.85 m	2.64 m	3.21 m
15	6.16 t (1.3)	3.09 t (9.3, 2H)	6.74 d (1.8)	6.19 d (1.8)	6.19 d (1.6)	6.10 d (1.9)
16		4.49 t (9.3, 2H)	7.54 d (1.8)	7.23 d (1.8)	7.22 d (1.6)	7.27 d (1.9)
17a	5.76 d (2.0)	2.12 s	2.38 s	1.04 d (7.0)	1.06 d (7.1)	9.22 d (5.1)
17b	5.43 d (2.0)
18	1.11 s	1.19 s	1.12s	1.06 s	1.20 s	1.04 s
19	1.10 s	1.27 s	1.14 s	1.09 s	1.13 s	1.08 s
20	1.27 s	1.46 s	1.31 s	1.15 s	1.15 s	1.21 s
1-OAc	2.06 s	1.99 s		2.09 s	2.10 s	2.10 s
2-OAc		2.01 s
3-OAc		2.07 s
6-OAc	2.05 s				2.11 s
7-OAc	1.95 s			2.07 s		1.96 s
1-OH			2.99 d (4.5)
5-OH		3.41 br s	3.53 br s	2.94 br s	3.16 br s	2.95 br s