Table 1.

¹H (500 MHz) and ¹³C NMR (125 MHz) spectral data of compound 1 in acetone-d₆.

Position	1H	13C	HMBC (Correlation with 1H)
1	-	137.4	1-OMe
2	-	136.9	4
3	-	141.7	4 *
4	6.21 (s)	109.7	7
5	-	117.9	7 *, 8
6	-	140.0	4, 7
7	4.12 (dd, J = 7.0, 5.5 Hz)	39.7	4, 8 *
8	2.67 (m), 2.74 (m)	45.9	7 *, 10, 14
9	-	130.9	7, 8 *, 13
10	6.13 (d, J = 2.0 Hz)	114.2	8, 14
11	-	147.5	13, 11-OMe
12	-	145.8	10, 14
13	6.56 (d, J = 8.0 Hz)	115.1	-
14	6.22 (dd, J = 8.0, 2.0 Hz)	122.9	8, 10
1′	-	147.2	6′ *, 1′-OMe
2′	-	134.0	6′
3′	-	142.4	7
4′	-	119.0	7 *, 8, 6′, 7′
5′	-	129.8	7, 8′
6′	6.66 (s)	108.5	7′
7′	2.76 (m), 2.84 (m)	34.5	6′, 8′ *
8′	2.80 (m)	38.0	7′ *, 10′, 14′
9′	-	134.2	8′ *, 13′
10′	6.77 (d, J = 2.0 Hz)	112.9	8′, 14′
11′	-	148.1	13′, 11′-OMe
12′	-	145.6	10′, 14′
13′	6.71 (d, J = 8.5 Hz)	115.6	-
14′	6.69 (dd, J = 8.5, 2.0 Hz)	121.6	8′, 10′
MeO-1	3.89 (s)	61.1	-
MeO-1′	3.81 (s)	56.7	-
MeO-11	3.56 (s)	55.9	-
MeO-11′	3.76 (s)	56.2	-

* Two-Bond coupling.