Table 2.

¹³C-NMR Data of compounds 1–3.

Carbon	1 a	2 b	3 b
1	111.3	111.0	112.3
2	153.3	153.5	156.0
3	99.7	99.7 c	117.7
4	157.9	157.9	158.6
5	128.8	128.8	129.6
6	116.6	116.6	114.4
7	154.1	154.1	156.8
8	110.9	110.9	115.4
9	126.7	126.8	31.8
10	125.0	124.7	31.4
4a	114.2	114.2	121.1
4b	123.6	123.6	126.3
8a	132.5	132.4	140.9
10a	133.4	133.3	141.9
1′	110.6	111.0	110.9
2′	153.1	153.3	154.3
3′	99.0	99.8 c	100.5
4′	157.7	157.8	160.5
5′	112.7	123.5	130.5
6′	145.6	117.4	117.2
7′	144.2	145.5	158.1
8′	111.7	140.8	109.5
9′	126.5	120.0	128.6
10′	121.5	124.7	126.5
4a′	113.8	114.2	116.7
4b′	124.4	124.3	126.6
8a′	125.6	126.2	134.5
10a′	133.8	133.4	135.2
4-OCH3	55.5	55.5	60.0
4′-OCH3	55.5	55.5	56.2
7′-OCH3			55.8
8′-OCH3		60.3

^{a 13}C-NMR data were measured at 150 MHZ in DMSO-d₆ for 1, δ in ppm; ^{b 13}C-NMR data were measured at 125 MHZ in DMSO-d₆ for 2, in CD₃OD for 3, δ in ppm, J in Hz; ^c the signals under the same superscript may be interchanged.