Table 1.

¹H NMR (500 MHz) and ¹³C NMR (125.7 MHz) data for 13–15 in CDCl₃ (δ in ppm and J in Hz).

	Carltonine A (13)		Carltonine B (14)		Carltonine C (15)
Position	δ C	δ H	δ C	δ H	δ C	δ H
1	59.2	2.58–2.46, m	59.3	2.56–2.45, m	55.2; 55.4	2.66–2.42, m
2	32.8	2.65, t (7.4)	32.7	2.66–2.58, m	32.7; 32.8	2.66–2.42, m
3	132.5		132.2		132.8
4	129.8	7.00–6.96, m	129.7	7.00–6.94, m	129.9	6.93–6.86, m
5	115.1	6.72–6.68, m	115.2	6.75–6.72, m	114.9	6.71–6.65, m
6	154.0		153.9		153.7
7	115.1	6.72–6.68, m	115.2	6.75–6.72, m	114.9	6.71–6.65, m
8	129.8	7.00–6.96, m	129.7	7.00–6.94, m	129.9	6.93–6.86, m
1′	58.5	3.45, d (14.0) 3.29, d, overlap (14.0)	58.3	3.46, d (13.2) 3.27, d (13.2)	55.1; 55.0	3.43, d (14.5) 3.29, d (14.5); 3.37, s
2′	130.1		130.6		131.2; 131.0
3′	132.1		133.3		131.9; 131.8
4′	113.2	6.76, s	110.2	6.75–6.72, m	113.23; 113.15	6.74, s
5′	146.9		145.9		146.7
6′	148.1		147.0		147.9
7′	111.1	7.10, s, overlap	108.6	7.07, s, overlap	110.6; 110.5	7.15, s; 7.14, s
2″	57.1	3.32, dt, overlap (17.3, 8.8) 3.20, dt (17.3, 8.8)	57.1	3.35, dt (17.5, 8.7) 3.16, dt (17.5, 8.7)	57.1; 57.0	3.27–3.17, m
3″	28.6	2.98, t (8.8)	28.6	3.00–2.93, m	28.6	2.99–2.91, m
3a″	131.2		131.2		131.1
4″	123.3	7.09, dd, overlap (7.4, 1.0)	123.4	7.08, d, overlap (7.4)	123.3	7.07, d (7.4)
5″	117.9	6.72, t, overlap (7.4)	118.1	6.70, t, overlap (7.4)	117.9; 117.8	6.71–6.65, m
6″	130.5	6.82, dd (7.4, 1.0)	130.4	6.79, d (7.4)	130.3; 130.4	6.77, d (7.4)
7″	123.0		122.9		122.8
7a″	150.4		150.4		150.3; 150.2
N-Me	42.3	2.20, s	41.9	2.18, s	-	-
N1″-Me	38.6	2.21, s	38.8	2.23, s	38.51; 38.48	2.14, s; 2.12, s
5′-OMe	55.8 or 55.9	3.34, s	-	-	55.9	3.84, s
6′-OMe	55.8 or 55.9	3.34, s	-	-	55.6	3.82, s; 3.81, s
-OCH2O-	-	-	101.0	5.99, s 5.98, s	-	-