Table 1.

Summary of ¹H and ¹³C NMR data for 4 and 5 in comparison with 3 in CD³OD

Position	3a		4		5
	𝛿H (mult, J in Hz)	𝛿C	𝛿H (mult, J in Hz)	𝛿C	Sh (mult, J in Hz)	𝛿C
2		172.6		174.8		176.8
3a	2.63-2.79 (2H, m)	40.3	2.40 (m)b	37.7	2.21 (m)	39.9
3b			2.28 (m)c		2.34 (m)b
4	2.19 (m)	27.2	2.50 (m)	32.5	2.48 (m)	33.7
5a	2.21 (dd, 12.3, 13.0)	35.4	2.28 (2H, m)c	39.1	2.26 (2H, m)b	41.5
5b	2.74 (m)
6		175.2		176.1		179.2
7a	1.37 (ddd, 11.2, 12.0, 12.0)	31.9	2.21 (m)c	31.3	2.24-2.31 (2H, m)b	31.9
7b	2.07 (m)		2.34 (m)
8	4.70 (ddd, 3.5, 5.3 11.2)	78.8	6.43 (brt, 6.5)	134.4	6.57 (brt, 6.5)	136.6
9	2.84 (ddd, 5.3, 5.3, 12.5)	49.4		138.7		137.4
10		212.2		204.8		205.6
11	2.45 (m)	28.9	2.41 (m)b	43.9	2.60 (m)	40.5
12a	1.90 (m)	42.5	1.27 (m)	40.8	1.72 (m)	38.2
12b	1.60 (m)		2.02 (m)		1.77 (m)
13	2.21 (m)	41.3	1.91 (m)d	30.3	2.05 (m)	26.0
14a	2.13 (m)	34.9	1.91 (m)d	35.9	2.17 (m)	34.4
14b	1.76 (m)		2.86 (m)		2.70 (m)
15	1.26 (d, 7.0)	17.2	1.11 (d, 6.4)	14.9	1.13 (d, 6.5)	16.3
16	0.94 (d, 6.5)	13.6	1.08 (d, 6.5)	21.2	1.09 (d, 6.5)	20.3

^a1H and ¹³C assignments were based on ¹H-¹H COSY, HMBC and HSQC spectra, which corrected the misassignments reported previously in Morishita et al.¹⁵

^b-dSignals overlapped.