Table 1.

Spectral data of compound 1: ¹H NMR and ¹³C NMR with key HMBC and COSY.

Units	Position	13C(ppm)	1H(ppm)	HMBC	COSY
Unit A	2A	80.3	4.37 (1H, d, J = 8.5 Hz)	C2′B; C1′B; C6′B	H-2A/H-3A
	3A	67.5	3.85 (1H, t)	C10A	H-3A/H-2A; H-3A/H-4A
	4A	29.8	2.82 (1Hα, dd, J = 4.16 Hz); 2.83 (1Hβ, brs)	C-2A; C-5A; C-10A; C-10A; C-3A	H-4A/H3A
	5A	155.8	-
	6A	96.5	6.90 (1H, s)	C-10A; C-8A; C-7A
	7A	155.8	-
	8A	106.7	-
	9A	151.1	-
	10A	100.0	-
	1′A	133.2	-
	2′A	115.5	6.82 (1H, d, J = 8.9 Hz)	C-1′A; C-3′A	H-2′A/H-6′A
	3′A	145.3	-
	4′A	145.9	-
	5′A	116.1	6.75 (1H, d, J = 2.4 Hz)	C-1′A; C-4′A	H-5′A/H-2′A
	6′A	119.5	6.73(1H, dd, J = 8.9; 2.4 Hz)	C-2A; C-2′A; C-3′A	H-6′A/H-2′A; H-6′A/H-5′A
Unit B	2B	72.6	4,11 (1H, d, J = 2,0 Hz)		H-2B/H-3B
	3B	78.9	5.69 (1H, brs)	C-1′B; C-2′B; C-6′B	H-3B/H-2B; H-3B/H4-B
	4B	38.3	4.55 (1H, brs)	C-10B; C-7A; C-8A; C-9A	H-4B/H3B
	5B	155.5	-
	6B	96.1	5.80 (1H, brs)	C-10B; C-7B; C-9B
	7B	156.0	-
	8B	106.4	-
	9B	151.8	-
	10B	108.9	-
	1′B	131.8	-
	2′B	115.7	6.63 (1H, d, J = 2.1 Hz)	C-1′BA; C-3′B	H-2′B/H-6′B
	3′B	145.5	-
	4′B	146.3	-
	5′B	116.7	7.30 (1H, d, J = 8.3 Hz)	C-1′B	H-5′B/H-2′B
	6′B	121.4	7.18 (1H, dd, J = 8.3, 21 Hz)	C-2B; C-3′A	H-6′B/H-2′B; H-6′B/H-5′B
Unit C	2C	99.9	-
	3C	67.2	3.28 (1H, d, J = 3.4 Hz)	C-2A; C-9A	H-3C/H-4C
	4C	28.9	4.14 (1H, d, J = 3.4 Hz)	C-7B; C-8B; C-9B; C-10C; C-9C; C-2C	H-4C/H-3C
	5C	156.7	-
	6C	98.3	5.95 (1H, d, J = 3.4 Hz)	C-10C; C-7C; C-8C	H-6C/H-8C
	7C	157.8	-
	8C	96.6	6.00 (1H, d, J = 3.3 Hz)	C-10C; C-7C; C-6C	H-8C/H-6C
	9C	154.2	-
	10C	104.9	-
	1′C	132.5	-
	2′C	115.7	7.02 (1H, d, J = 2.0 Hz)	C-2C; C-3′C	H-2′C/H-6′C
	3′C	145.8	-
	4′C	146.6	-
	5′C	116.0	6.75 (1H, d, J = 8.3 Hz)	C-1′C; C-4′C	H-5′C/H-2′C
	6′C	119.9	6.84 (1H, dd, J = 8.3, 2.1 Hz)	C-2C; C-1′C	H-6′C/H-2′C; H-6′C/H-5′C