Table 1.

¹H- and ¹³C-NMR spectral data of HA and iso-HA (in CD₃OD).

Position	HA (1)				iso-HA (2)
	δ 13C	δ 1H	Multi	J (Hz)	δ 13C	δ 1H	Multi	J (Hz)
1	174.0	_		_	174.0	_		_
2	119.3	7.0	d	15.6	119.4	7.05	d	15.25
3	146.2	7.57	m	_	146.2	7.47	dd	10.17; 5.4
4	129.7	6.35	m	_	129.7	6.35	m	_
5	148.5	6.30	m	_	148.5	6.30	m	_
6	35.4	2.19	m	_	35.4	2.19	m	_
7	21.8	1.50	m	_	21.8	1.50	m	_
8	13.7	0.93	m	_	13.7	0.93	m	_
2'	174.0	_		_	174.0	_		_
3'	99.6	_	q	_	99.5	_	q	_
4'	195.0	_		_	195.1	_		_
5'	63.7	3.62	dd	1.17, 9.3	63.6	3.80	dd	2.7, 4.6
6'a	34.9	2.20	dd		34.8	2.2	c
6'b		2.51				2.2
7'	78.1	_	q	_	78.0	_	q	_
8'	35.9	2.02	m	_	35.8	2.02	m	_
9'	17.2	0.98	m	_	17.2	0.98	m	_
10'	16.4	0.99	m	_	16.4	0.99	m	_
11'	27.4	2.99	s	_	27.3	2.98	s	_
12'	176.8	_		_	176.7	_		_

c: Overlapping NMR signals. Abbreviation, s: singlet, d: doublet, dd: doublet of doublets, m: multiplet, q: quartet.