Table 1.

¹H and ¹³C NMR spectroscopic data for kalkipyrone B (2)^a, ^b.

position	αC, type	αH, (J in Hz)	COSY	HMBC	NOESYc
1	162.1, qC
2	99.3, qC
3	181.0, qC
4	118.0, qC
5	157.2, qC
6	29.9, CH2	3.29 d (7.3)	7, 17, 18	5, 7, 8	17
7	116.8, CH	5.21 ovlp	6, 17, 18	6, 9, 17	9
8	138.8, qC
9	39.2, CH2	2.00 t (7.7)	10	7, 8, 10, 11, 17
10	25.9, CH2	1.52 m	9, 11	8, 9
11	38.9, CH2	1.93 t (7.7)	10	9, 10, 12, 13, 16
12	137.4, qC
13	129.0, CH	5.20 ovlp	14, 16	11, 16	11, 15
14	64.7, CH	4.58 m	13, 15	12, 13	15, 16
15	23.5, CH3	1.23 d (6.3)	14	13, 14
16	16.4, CH3	1.67 s		11, 12, 13
17	16.2, CH3	1.72 s	6	7, 8, 9
18	10.1, CH3	1.96 s	6	3, 4, 5
19	6.8, CH3	1.84 s		1, 2, 3
20	55.4, CH3	3.93 s		1

^aData obtained on a Varian 500 MHz instrument in CDCl₃.

^bovlp = overlapped signals.

^cdata taken in DMSO.