TABLE 1

¹H-NMR (500 MHz, DMSO) and ¹³C-NMR (125 MHz, DMSO) spectral data for 5-HRB.

No.	¹H-NMR	1³C-NMR	No.	¹H-NMR	¹³C-NMR
1	1.70 m	25.0t	13	—	44.7s
1	1.25 m	25.0t	13	—	44.7s
2	1.56 m	27.5t	14	—	73.6s
2	1.46 m	27.5t	14	—	73.6s
3	3.99 brs	66.7d	15	3.58 s	59.6d
4	2.08 m	36.8t	16	2.33 (dd, 10.5, 14.5)	31.7t
4	1.30 m	36.8t	16	2.33 (dd, 10.5, 14.5)	31.7t
5	—	74.3s	17	2.52 (d, 10.5)	46.2d
6	1.53 m	34.2t	18	0.66 (3H, s)	16.7q
6	1.14 m	34.2t	18	0.66 (3H, s)	16.7q
7	1.42 m	22.6t	19	0.86 (3H, s)	16.9q
7	0.93 m	22.6t	19	0.86 (3H, s)	16.9q
8	1.85 m	32.5d	20	—	122.1s
9	1.54 m	41.9d	21	7.52 (d, 2.0)	150.7d
10	—	40.6s	22	7.75 (dd, 2.0, 10.0)	147.6d
11	1.48 m	21.4t	23	6.24 (d, 10.0)	114.4d
11	1.25 m	21.4t	23	6.24 (d, 10.0)	114.4d
12	1.62 m	38.5t	24	—	161.2s
12	1.41 m	38.5t	24	—	161.2s