Table 1.

¹H (400 MHz, CDCl₃) and ¹³C (100 MHz, CDCl₃) NMR data and COSY and HMBC for 1.

Position	δH (J in Hz)	δC, Type	COSY	HMBC
1a/b	1.50 m; 1.81 m	31.0, CH2	H2-2	C-3
2a/b	1.40 m; 1.93 m	30.8, CH2	H2-1, H-3	n. o. a
3	3.51 m	71.4, CH	H2-2, H2-4	n. o.
4a/b	2.23 m; 2.44 m	40.6, CH2	H-3	C-3, C-5, C-6
5	-	140.4, C	-	-
6	5.47 brd (5.6)	121.5, CH	H2-7	C-4, C-7, C-8, C-10
7a/b	1.98 m; 2.40 m	33.1, CH2	H-6, H-8	C-5, C-6
8	3.03 ddd (12.4, 12.4, 6.8)	43.8, CH	H2-7, H-14	C-7, C-9, C-14
9	-	217.5, C	-	-
10	-	48.4, C	-	-
11a/b	3.86 m; 3.74m	59.4, CH2	H2-12	n. o.
12	1.33 m; 1.67 m	40.2, CH2	H2-11	C-11, C-13
13	-	45.5, C	-	-
14	2.61 m	42.1, CH	H-8, H2-15	C-9
15	1.31 m; 1.58 m	24.6, CH2	H-14, H2-16	C-14
16	1.31 m; 1.71 m	24.8, CH2	H2-15, H-17	n. o.
17	1.78 m	49.6, CH	H2-16, H-20	n. o.
18	0.69 s	17.7, CH3	-	C-12, C-13, C-14, C-17
19	1.40 s	22.8, CH3	-	C-1, C-5, C-9, C-10
20	2.25 m	38.5, CH	H-17, H3-21, H-22	C-16
21	1.08 d (6.4)	22.1, CH3	H-20	C-17, C-20
22	5.65 dd (16.0, 7.2)	134.6, CH	H-20, H-23	C-20, C-21, C-24
23	5.93 d (16.0)	130.2, CH	H-22	C-20, C-24, C-25, C-28
24	-	153.0, C		-
25	2.54 m	29.4, CH	H3-26, H3-27	C-24, C-28
26	1.06 d (6.8)	22.4, CH3	H-25	C-24, C-25
27	1.07 d (6.8)	21.5, CH3	H-25	C-24, C-25
28	4.83 d (6.8)	109.8, CH2		C-24, C-25

^a n. o. = not observed.