Table 1. ¹³C NMR Data of Compounds 1–5 (Methanol-d₄, T = 298 K, δ ppm).

position	1a	2b	3b	4b	5b
1	133.91	132.32	132.30	132.29	132.30
1a	129.50	130.39	130.20	130.21	130.37
2	155.84	156.31	156.35	156.35	156.31
3	122.06	121.70	121.81	121.81	121.69
4	129.97	129.95	129.98	129.97	129.95
4a	131.07	130.94	131.10	131.09	130.95
5	156.81	156.73	156.74	156.75	156.71f
5a	118.00	118.15	118.12	118.13	118.13
6	107.65	107.62	107.60	107.65	107.67g
7	157.65	157.44	157.78	157.61	157.47e
8	121.19	120.83	120.96	120.97	120.95c
8a	131.23	131.14	130.94	130.95c	130.91h
9	192.01	n. o.	192.38	192.44d	192.68d
10	192.77	192.06	193.57	193.68	193.81
11	23.07	31.26	31.84	31.22	31.25
12	44.21	50.13	50.02	50.04	50.12
13	71.98	148.85	149.07	149.07	148.83
14	28.99	112.61	112.29	112.30	112.60
15	28.86	18.56	18.59	18.58	18.54
16		28.28	28.04	28.05	28.13
17		42.85	42.84	42.83	42.85
18		71.46	71.47	71.46	71.46
19		29.30	29.30	29.28	29.30
20		28.88	28.86	29.00	28.99
1′	133.91	132.32	132.30	133.92	133.92
1′a	129.50	130.39	130.20	129.51	129.52
2′	155.84	156.31	156.35	155.84	155.84
3′	122.06	121.70	121.81	122.06	122.05
4′	129.97	129.95	129.98	129.97	129.95
4a′	131.07	130.94	131.10	131.25	131.25
5′	156.81	156.73	156.74	156.88	156.79f
5a′	118.00	118.15	118.12	118.01	118.01
6′	107.65	107.62	107.60	107.65	107.60g
7′	157.65	157.44	157.78	157.85	157.60e
8′	121.19	120.83	120.96	121.17	121.06c
8a′	131.23	131.14	130.94	131.09c	131.25h
9′	192.01	n. o.	192.38	191.98d	191.96d
10′	192.77	192.06	193.57	192.67	192.68
11′	23.07	31.26	31.24	23.06	23.07
12′	44.21	50.13	50.02	44.21	44.22
13′	71.98	148.85	149.07	71.98	71.98
14′	28.99	112.61	112.29	28.86	28.88
15′	28.86	18.56	18.59	28.86	28.88
16′		28.28	28.04
17′		42.85	42.84
18′		71.46	71.47
19′		29.30	29.30
20′		28.88	28.86
7-OCH3,	56.29	56.27	56.28	56.28	56.28
7′-OCH3	56.29	56.27	56.28	56.28	56.28

^a125 MHz.

^b175 MHz; n.o. not observed.

^c,d,e,f,g,hSignals in each column are interchangeable.