Table 1.

¹H and ¹³C Nuclear Magnetic Resonance (NMR) (500 and 125 MHz, 300 K) assignments of the aglycone of compound (1) in pyridine-d₅.

Atom No.	13C NMR	1H NMR
1	40.7	0.75 m, 1.86 m
2	20.1	1.36 m, 2.29 m
3	38.9	1.01 m, 2.30 m
4	44.7	-
5	57.9	1.05 d (13.1)
6	23.9	2.23 m, 2.39 m
7	43.0	1.40 m, 1.80 m
8	41.6	-
9	54.8	0.91 d (7.9)
10	40.2	-
11	20.6	1.68 m, 1.88 m
12	39.0	1.95 m, 2.69 m
13	88.0	-
14	43.9	1.99 m, 2.74 d (10.6)
15	46.9	1.87 m, 2.02 m
16	153.7	-
17	105.4	4.89 bs, 5.71 bs
18	28.7	1.33 s
19	177.3	-
20	17.1	1.37 s