Table A1.

¹³C and ¹H NMR data of 2,3-dehydrosilybin and 2,3-dehydrosilychristin.

	2,3-Dehydrosilybin					2,3-Dehydrosilychristin
Atom Nº	δ C	m.	δ H	m.	JHH (Hz)	δ C	m.	δ H	m.	JHH (Hz)
2	145.49	s				146.67	s	-
3	n.a.					n.a.		-
4	176.04	s				175.75	s	-
4a	102.87	s				102.88	s	-
5	160.55	s				160.62	s	-
6	98.22	d	6.189	d	1.8	98.12	d	6.187	d	2.0
7	164.25	s				163.93	s	-
8	93.46	d	6.450	d	1.8	93.26	d	6.406	d	2.0
8a	156.12	s				156.06	s	-
10	78.40	d	4.268	ddd	2.5, 4.6, 7.9	87.40	d	5.544	d	6.6
11	75.75	d	4.964	d	7.9	52.88	d	3.553	m	-
11a						129.73	s	-
12						115.45	d	7.606	br s	-
12a	143.25	s
13	116.01	d	7.786	br s	-	n.a.	s	-
14	123.80	s				115.70	d	7.630	d	1.7
15	121.01	d	7.758	br m	-	140.82	s	-
15a						148.60	s	-
16	116.68	d	7.111	d	8.7	132.02	s	-
16a	144.80	s
17	127.14	s				110.44	d	6.960	d	2.0
18	111.69	d	7.041	d	2.0	147.51	s	-
19	147.56	s				146.46	s	-
20	147.01	s				115.29	d	6.771	d	8.1
21	115.24	d	6.819	d	8.0	118.68	d	6.811	dd	2.0, 8.1
22	120.45	d	6.887	dd	2.0, 8.0	62.89	t	3.740	dd	5.5, 10.9
								3.694	dd	6.7, 10.9
23	60.00	t	3.571	dd	2.5, 12.3
			3.376	dd	4.6, 12.3
3-OH			n.a.					n.a.
5-OH			n.a.			-		12.462	br s	-
7-OH			n.a.					n.a.
18-OMe						55.60	q	3.756	s	-
19-OMe	55.63	q	3.790	s	-
20-OH			n.a.					n.a.
22-OH						-		n.d.
23-OH			n.d.
x-OH						-		9.575	br s	-
								9.021	br s	-

For Atom Nº, see Figure 1; m.: multiplicity; s: singlet, d: doublet, t: triplet, q: quartet, dd: doublet of doublets, ddd: doublet of doublets of doublets, br s: broad singlet, br m: broad multiplet; n.a.: not assigned, n.d.: not detected.