Table 1.

NMR Spectroscopy data at 500 MHz for ¹H and 125 MHz for ¹³C for compounds 1 and 2.

	Leucodine (1)				Dehydroleucodine (2)
Position	δH	δC	HMBC	COSY	δH	δC	HMBC	COSY
1		169.92				169.4
2	6.16 (q,1.2)	135.55	195.9, 169.9, 131.9, 52.6, 19,8	3.41, 2.29	6.17 (q, 1.2)	135.8	195.7, 131.9, 53.0, 169.4, 19.8	2.33
3		195.91				195.7
4		131.85				131.9
5		152.10				151.8
6	2.42 (ddd, 14.5, 12.5, 2) 2.33 (ddd, 14.5, 6, 2)	37.55	152.1, 131.9, 56.4, 26.0, [21.6]a	2.33, 1.99, 1.36 2.42, 1.99, 1.36	2.52 (ddd, 1.5, 12.5, 2) 2.39 (ddd, 14.5, 6, 2)	37.3	151.9, 131.9, 53.1, 24.5 151.9, 131.9, 53,1, 21.8	2.39, 2.22, 1.44 2.52, 2.22, 144
7	1.99 (m) 1.36 (dddd, 14, 12,10, 2)	25.98	152.1, 84.2, 56.4, 37,5	2.42, 2.33, 1.95, 1.36 2.42, 2.33, 1.99, 1,95	2.22 (dddd, 14, 6, 3,2) 1.44 (dddd, 14, 12, 10, 2)	24.5	151.9, 84.4, 53.1, 37.3 151.9, 84.4, 53.1, 37.3	2.89, 2.52, 2.39, 1.44 2.89, 2.52, 2.39, 2.22
8	1.96 (m)	56.37	84.2, 52.6, 41.1, 12.3	2.25, 1.99, 1.36	2.89 (ddd, 12, 10, 3)	53.1	138.5, 119.0, 84.4, 37.3	6.18, 5.47, 3.62, 2.22, 1.44
9	3.62 (t,10.0)	84.20	163.9, 131.9, [56.4], 41.1, 26.0	3.41, 1.95	3.62 (t,10)	84.4	[138.5], 131.9, 53.0, 24.5, [169.4]	3.52, 2.89
10	3.41 (bd, 10)	52.56	[195.9], 169.9, 152.1, 135.6, 131.9, 84,6	6.16, 3.62, [2.44], 2.29	3.52 (bd, 10)	53.0	[151.9], 135.8, 131.9, 84.4, 53.1, 169.4	3.62, 2.44, 2.33
11		177.54				169.1
12	2.25 (dq, 12.5, 6.9)	41.13	177.5, 56.4, 26.0, 12.3	1.95, 1.27		138.5
13	1.27 (d,6.9, 3H)	12.28	177.5, 56.4, 41.1	2.25	6.18 (d,3.3) 5.47 (d,3.3)	119.0	169.1, 138.5, 53,1 169.1, [138.5], 53.1	5.47, 2.89 6.18, 2.89
14	2.29 (t, 1.2, 3H)	19.80	169.9, 135.6, 52.6	6.16, 3.41	2.33 (t,1.2, 3H)	19.8	135.8, 53.0, 169.4	6.17, 3.52
15	2.44 (bs, 3H)	21.61	152.1, 131.9, 37.6	[3.4]	2.44(bs,3H)	21.8	151.9, 131.9, 37.3	3.52

^aFigures in brackets detonate weak long range correlations