Table 1.

¹³C and ¹H NMR data of compounds 1–3 in CD₃OD.

No.	1 a		2 b		3 c
	δC, Type	δH (J in Hz)	δC, Type	δH (J in Hz)	δC, Type	δH (J in Hz)
1	111.7, CH	7.51, d (0.5)	111.8, CH	7.51, d (0.5)	129.0, C
2	164.0, C		163.7, C		165.5, C d
3	133.8, C		133.8, C		134.5, C
4	131.2, CH	7.65, d (0.5)	131.3, CH	7.65, d (0.5)	130.5, CH	8.00, s
4a	126.8, C		127.1, C		131.2, C
5	165.8, C		166.2, C		106.9, CH	7.20, d (2.5)
6	125.3, C		125.7, C		167.1, C
7	104.6, CH	6.78, s	104.3, CH	6.80, s	105.9, CH	6.52, d (2.5)
8	166.9, C		167.1, C		166.0, C
8a	111.9, C		111.7, C		112.1, C
9	188.7, C		188.6, C		191.0, C
9a	134.7, C		134.6, C		132.8, C
10	183.5, C		183.5, C		182.3, C
10a	133.4, C		132.8, C		137.8, C
11	16.6, CH3	2.23, s	16.6, CH3	2.23, s	17.9, CH3	2.21, s
12	56.9, CH3	3.69, s	56.9, CH3	3.70, s	56.3, CH3	3.89, s
1′	70.6, CH	4.73, d (7.5)	70.6, CH	4.73, d (7.4)	75.2, CH	4.58, d (4.7)
2′	75.2, CH	3.79, d (7.5)	75.2, CH	3.76, d (7.4)	70.7, CH	3.93, d (4.7)
3′	74.6, C		74.7, C		75.4, C
4′	70.1, CH	4.26, s	70.2, CH	4.26, s	70.6, CH	4.39, s
4a’	143.8, C		143.9, C		144.7, C
5′	166.3, C		166.5, C		130.7, C
6′	123.4, C		123.9, C		166.8, C
7′	104.6, CH	6.81, s	104.6, CH	6.82, s	104.5, CH	6.79, s
8′	166.1, C		166.4, C		165.9, C
8a’	111.0, C		111.0, C		110.9, C
9′	190.5, C		190.6, C		189.6, C
9a’	143.9, C		143.7, C		141.0, C
10′	185.7, C		185.5, C		185.7, C
10a’	130.8, C		130.7, C		n.d. e
11′	22.3, CH3	1.33, s	22.3, CH3	1.32, s	21.6, CH3	1.33, s
12′	57.0, CH3	3.70, s	57.0, CH3	3.71, s	56.8, CH3	3.71, s
13′					62.8, CH3	3.77, s

^a–c Measured at 150/600, 100/400, and 200/800 MHz for ¹³C/¹H NMR, respectively. ^d Assigned by HMBC data. ^e Not detected.