Table 1.

NMR Data of Compounds 1 and 2

	1			2
	1H NMR	13C NMR	15N NMR	1H NMR	13C NMR
1	4.16 (d, 9.6)	53.5		4.13 (d, 9.3)	60.1
N-2a			46.3
3	3.25 (dt, 11.5, 6.0) 2.84 (m)	49.3		2.96 (m) 2.90 (m)	40.4
4	2.80 (2H, m)	23.0		2.77 (2H, m)	23.0
4a		108.7			108.3
5a		127.4			127.4
5	7.46 (d, 7.6)	118.2		7.45 (d, 7.6)	118.2
6	7.04 (t, 7.6)	119.0		7.03 (t, 7.6)	118.9
7	7.11 (t, 7.6)	121.3		7.10 (t, 7.6)	121.3
8	7.31 (d, 8.0)	111.3		7.30 (d, 7.6)	111.3
8a		136.1			136.1
9	9.17 (s)			9.04 (s)
N-9			123.8
9a		134.7			134.9
10	1.58 (m)	43.0		1.63 (m)	40.4
11	3.51 (d, 2.7)	74.5		3.39 (d, 2.7)	74.7
12		64.7			64.6
13	2.47 (ddd, 15.1,  10.5, 4.0)	31.0		2.45 (m)	31.4
	1.37 (m)			1.20 (m)
14	2.63 (m)	18.6		2.54 (m)	18.7
	1.80 (m)			1.73 (m)
15	5.48 (m)	130.0		5.46 (m)	130.1
16	5.29 (m)	131.1		5.30 (m)	131.0
17	2.70 (m)	25.0		2.68 (m)	25.0
	1.81 (m)			1.82 (m)
18	1.15 (m)	27.6		1.16 (m)	27.6
	1.77 (m)			1.76 (m)
19	1.73 (m)	27.0		1.37 (m)	27.0
	1.41 (m)			1.74 (m)
20	2.55 (m)	46.6		2.52 (m)	46.7
	2.12 (m)			2.08 (m)
N-21			36.9
22	3.75 (q, 5.6)	57.9		3.54 (m)	58.6
23	1.44 (m)	26.8		1.49 (m)	27.9
	1.78 (m)			1.74 m)
24	2.11 (m)	33.6		1.98 (m)	39.4
25		45.2			45.3
26	2.93 (s)	66.9		2.95 (s)	66.7
N-27			32.6
28	3.09 (m)	48.0		3.10 (m)	48.1
	2.72 (m)			2.69 (m)
29	1.74 (2H, m)	27.3		1.65 (2H, m)	27.4
30	1.47 (m)	26.2		1.46 (m)	26.2
	1.86 (m)			1.72 (m)
31	2.22 (m)	24.3		2.25 (m)	24.3
	2.03 (m)			1.98 (m)
32	5.53 (m)	131.1		5.55 (m)	130.8
33	5.53 (m)	130.8		5.55 (m)	130.6
34	2.05 (m)	21.4		2.26 (m)	21.2
	2.24 (m)			2.00 (m)
35	1.50 (m)	33.3		1.63 (m)	33.1
	1.60 (m)			1.44 (m)
36	2.88 (d, 10.0)	57.5		2.93 (d, 9.6)	57.2
	2.39 (d, 10.0)			2.28 (d, 9.6)
37	3.06 (dd, 16.6,  5.8)	45.2		2.89 (m)	49.6
	2.63 (dd, 16.6,  8.6)			2.54 (dd, 15.8,  7.6)
38		208.6			207.4
39	2.17 (3H, s)	30.9		2.27 (s)	30.6

^a15N NMR chemical shifts were measured using ¹H–¹⁵N HMBC spectra.