Table 2. ¹³C NMR Data for 2ab (CDCl₃, 101 MHz).

	BEAA (2a)		allo-BEAA (2b)
position	natural4	synthetic	biosynthetic5	synthetic
Hiv	2 units	2 units	2 units	2 units
1 C=O	169.94 or 169.24	169.96 or 169.94 or 169.91 or 169.48 or 169.44	169.78, 169.64	169.64
2	75.4	75.52, 75.48	75.64	75.63
3	29.7	29.71, 29.69	29.74, 29.70	29.75, 29.72
4	17.54	17.46, 17.43	17.43	17.48, 17.43
4′	18.29	18.28, 18.26	18.32	18.35, 18.34
Hmp	1 unit (2R,3S)	1 unit (2R,3S)	1 unit (2R,3R)	1 unit (2R,3R)
1 C=O	169.94 or 169.24	169.96 or 169.94 or 169.91 or 169.48 or 169.44	169.61	169.92
2	74.22	74.30	74.27	74.25
3	35.81	35.84	35.62	35.62
4	24.47	24.40	24.53	24.55
5	11.31	11.30	10.63	10.63
3-Me	14.34	14.35	13.27	13.27
NMePhe	3 units	3 units	3 units	3 units
1 C=O	169.94 or 169.24	169.96 or 169.94 or 169.91 or 169.48 or 169.44	169.99, 169.94, 169.92	169.97, 169.92, 169.89
2	57.53, 57.52	57.30, 57.16	57.36, 56.64	57.35, 56.64
3	34.83, 34.68	34.79, 34.68, 34.62	34.84, 34.73, 34.62	34.87, 34.75, 34.64
4	136.64	136.60, 136.59, 136.56	136.64, 136.58, 136.48	136.66, 136.60, 136.49
5–9	128.92, 128.53, 126.76	128.86, 128.83, 128.82, 128.51, 128.45, 126.75	128.81, 126.77, 128.53	128.84, 128.82, 128.80, 128.53, 126.78
N–CH3	32.43, 32.37	32.22, 32.19	32.33, 31.86	32.35, 31.87