Table 2.

¹H and ¹³C NMR Data^† (J values in Hz, in parenthesis) for (3/3a) and (4/4a)

H/C	Isoprosopilosine (3/3a)		Isoprosopilosidine (4/4a)
	δH	δC	δH	δC
2, 2′	3.12 dq	49.9 d	3.18 dq (6)	51.6 d
	2.77 dq (6)	56.0 d	2.78 dq (6)	55.0 d
3, 3′	3.62 m	69.1 d	3.78 ddd (5, 5, 5)	69.0 d
	3.50 br. s	68.0 d	3.61 br.s	66.9 d
4, 4′	1.63 m	27.0 t	1.72 m, 1.62 m	26.9 t
	1.51 m, 1.86 m	32.5 t	1.93 m, 1.65 m	31.6 t
5, 5′	1.43 m, 1.63 m	28.1 t	1.69 m	29.1 t
	1.23 m	26.5 t	1.53 m	25.2 t
6, 6′	2.84 m	50.4 d	2.84 m	48.4 d
	2.58 m	57.4 d	2.58 m	56.5 d
7, 7′	1.08 d (6)	16.0 q	1.14 d (7)	16.0 q
	1.09 d (6)	18.8 q	1.14 d (7)	18.8 q
1″, 1‴	1.72 m	37.3 t	1.72 m	37.3 t
	1.32 m	28.4 t	1.32 m	28.4 t
2″, 2‴		30.4, 30.2,		30.7, 29.9,
3″-8″		30.0, 29.9,		29.6, 29.4,
3‴-8‴	1.41–1.26 m*	29.9, 29.8,	1.48–1.25 m*	29.2, 26.4,
9″, 9‴		29.6, 26.2 (8 × t)		25.9 (7 × t)
10″	2.00 t (7.5)	35.4 t	2.83 m*	32.1 t
10‴	1.41–1.26 m*	29.8*	2.83 m*	31.7 t
1″″	1.45 m	33.4 t	2.83 m*	30.7 t
2″″	1.81 m	21.8 t	2.54 m	21.1 t
3″″	3.11 dd (18, 7.8)	54.7 t	4.87 m	59.4 t
	2.09 dd (18, 9.5)
5″″	3.29 d (15.5)	55.5 t	8.64 s	137.3 d
	2.61 d (15.5)
6″″	-	136.2 s	-	141.3 s
7″″	5.36 s	123.8 d	8.17 s	144.3 d
8″″	2.00 m	42.9 d	-	139.2 s
8a″″	1.72–1.81 m	65.7 d	-	155.0 s

^†All spectra recorded in CD₃OD at 500 MHz (¹H) and 125 MHz (¹³C).

^*Overlapped signals.