Table 1.

NMR Spectroscopic Data of Leptazoline A (1) in DMSO-d₆

no.	δC, type	δH (J)	COSY	HMBC or CIGAR
1	173.8,C
2	39.0,CH2	2.46, dd (15.4, 3.8) 2.37, dd (15.3, 8.6)		1, 3, 4
3	68.0,CH	3.99, dt (8.6, 3.8)	2, 4	1, 2c, 5
4	75.7,CH	3.93, dd (6.3, 3.8)		2, 3, 6, 7, 8c
5	77.7,CH	4.77, p (6.3)	4, 6	3, 4c, 7
6	20.5,CH3	1.38, d (6.3)		4, 5
7	163.4,C
8	111.7,C
9	158.2,C
10	118.5,CH	7.02, d (8.8)	11	7w, 8, 9, 12, 13w
11	133.2,CH	7.47, dd (8.8, 2.7)		8w, 9, 12, 13
12	122.2,C
13	126.6,CH	7.53, d (2.7)	11w	7, 9, 10c, 11, 12
NH	−170.4a	12.28, brs

^aNitrogen chemical shift from ¹H−¹⁵N HMBC

^b15N referenced to MeNO₂ (IUPAC std). Referenced to NH₃ it resonates at 210.1 ppm

^CCIGAR only

^wWeak correlations