Table 1.

¹H and ¹³C-NMR signal assignment.

1H-NMR signal assignment			13C-NMR signal assignment
Hydrogen	δ (ppm)	Multiplicity	Carbon	δ (ppm)
1 + NH+	1.47	Quadruplet	1	10.25–10.15
2	2.75–3.70	Multiplet	2	45.75–46.49
3	3.39	Triplet	3	58.27
4	1.51–2.01	—	4	23.81
5	1.28–1.86	—	5	24.64
6	1.44–1.91	—	6	24.46
7	1.68–1.86	—	7	29.91
8	4.90	Triplet	8	52.04
9	2.98	Singlet	9	33.24
10	—	—	10	171.46
11	—	—	11	132.37
12	7.72	Singlet	12	129.54
13	—	—	13	135.80
14	—	—	14	133.97
15	7.89	Doublet	15	127.79
16	7.45	Doublet	16	130.51

δ: chemical shift.