Table 1.

¹H and ¹³C NMR data for svalbamides A (1) and B (2) in DMSO-d₆.

			Svalbamide A (1) a		Svalbamide B (2) a
Position			δC, Type	δH, Mult (J in Hz)	δC, Type	δH, Mult (J in Hz)
3-amino-2-pyrrolidinone		1	174.2, C		174.2, C
		2	49.4, CH	4.30, m	49.5, CH	4.27, m
		3a	28.0, CH2	1.82, m	28.3, CH2	1.76, m
		3b		2.26, m		2.29, m
		4	38.0, CH2	3.16, m	38.0, CH2	3.16, m
		4-NH		7.78, br s		7.81, br s
		2-NH		8.10, d (8.5)		8.21, d (8.5)
d-Val		5	171.0, C		171.0, C
		6	57.2, CH	4.18, dd (9.0, 6.5)	57.2, CH	4.20, dd (9.0, 6.5)
		7	30.7, CH	1.96, m	30.6, CH	1.94, m
		8	18.0, CH3	0.84, d (7.0)	18.0, CH3	0.83, d (7.0)
		9	19.3, CH3	0.88, d (7.0)	19.1, CH3	0.84, d (7.0)
		6-NH		7.83, d (9.0)		7.85, d (9.0)
3-hydroxy-8-methyldecanoic acid		10	170.8, C		170.8, C
		11a	43.4, CH2	2.23, dd (14.0, 7.0)	43.4, CH2	2.25, dd (14.0, 7.0)
		11b		2.29, dd (14.0, 5.0)		2.28 dd (14.0, 5.0)
		12	67.5, CH	3.78, m	67.6, CH	3.78, m
		13	36.7, CH2	1.33, m b	36.7, CH2	1.33, m b
		14a	25.2, CH2	1.24, m b	25.2, CH2	1.24, m b
		14b		1.34, m b		1.34, m b
		15	26.5, CH2	1.23, m b	26.5, CH2	1.23, m b
		16a	36.0, CH2	1.05, m	36.0, CH2	1.05, m
		16b		1.25, m b		1.25, m b
		17	33.7, CH	1.28, m b	33.7, CH	1.28, m b
		18a	28.9, CH2	1.09, m	28.9, CH2	1.09, m
		18b		1.28, m b		1.28, m b
		19	11.2, CH3	0.82, t (7.0)	11.2, CH3	0.83, t (7.0)
		20	19.1, CH3	0.81, d (6.5)	19.1, CH3	0.81, d (6.5)
		12-OH		4.65, d (5.0)		4.67, d (5.0)

^{a 1}H and ¹³C NMR data were recorded at 800 and 200 MHz, respectively. ^b Overlapping signals.