Table 1.

¹H and ¹³C NMR (CDCl₃, 300.13 MHz and 75.47 MHz) and HMBC assignment for 1.

Position	δC, Type	δH, (J in Hz)	COSY	HMBC
1	38.2, CH2	1.05, m	H-2
2	23.3, CH2	1.65, m	H-1, 3
		1.33, dd (12.9, 4.2)	H-1, 3	C-4
3	80.8, CH	4.48, dd (10.9, 4.6)	H-2	C-1, 4, 21, 22
4	37.8, C	-
5	55.4, CH	0.91, dd (12.0, 2.2)	H-6
6	18.7, CH2	1.62, m	H-5
		1.14, m
7	40.5, CH2	1.18, dd (12.5, 3.6)
		1.88, m
8	39.8, C	-
9	59.8, CH	1.02, dd (12.3, 2.6)
10	37.4, C	-
11	23.6, CH2	1.70, m
12	38.0, CH2	2.38, m
		1.92, m		C-14, 25
13	147.7, C	-
14	56.4, CH	1.59, m	H-15
15	19.6, CH2	1.86, m	H-14, 16	C-13
16	37.2, CH2	2.08, m	H-15
17	194.7, CO	-
18	99.9, CH	5.45, s		C-16, 17, 19, 20
19	191.1, C	-
20	24.9, CH3	2.05, s		C-18, 19
21	16.3, CH3	0.83, s		C-3, 4, 5, 22
22	28.0, CH3	0.86, s		C-3, 4, 5, 21
23	16.4, CH3	0.84, s		C-1, 5, 9, 10
24	15.3, CH3	0.69, s		C-7, 8, 9, 14
25a	106.4, CH2	4.84, brs		C-12, 14
b		4.50, brs		C-12, 13, 14
26	171.0, CO	-
27	21.3, CH3	2.05, s		C-26
OH-19		15.47, s