Table 2.

¹H- and ¹³C-NMR data (500 and 125 MHz) ^a of 2 in CD₃CN.

Position	δC, Type	δH, (J in Hz)	HMBC
1	33.6, CH2	2.18, dd (13.9, 6.8); 1.21, m	C-2, 3, 6, 7, 10, 11
2	40.4, CH	2.74, dt (13.9, 7.2)	C-1, 4, 5, 6
3	42.0, CH	2.45, p (7.4)	C-2, 4, 18
4	212.4, CO	-
5	58.4, CH	3.29, s	C-4, 6
6	79.4, C	-
7	51.7, C	-
8	216.6, CO	-
9	86.1, CH	4.38, d (2.8)	C-8, 10, 20
10	54.6, C
11	61.5, C
12	33.2, CH2	1.89, ddd (12.3, 8.8, 3.9); 1.59, m	C-7, 10, 11, 13
13	23.5, CH2	1.59, m
14	52.7, CH	1.38, td (9.5, 2.5)	C-9, 10, 15, 16, 17, 20
15	29.0, CH	2.09, pd (6.9, 2.5)	C-10, 13, 14, 16, 17
16	25.2, CH3	0.84, d (5.4)	C-14, 15, 17
17	19.8, CH3	0.83, d (5.6)	C-16
18	9.5, CH3	0.94, d (7.4)	C-2, 3, 4
19	15.4, CH3	0.92, s	C-6, 7, 8, 11
20	16.2, CH3	1.21, s	C-9, 10, 11, 14

^a Assignments (δ values) were confirmed by the HSQC and HMBC experiments.