Table 2.

¹³C NMR spectroscopic data of 1, 3, 4, 5 and 7 ^a. δ_C in ppm.

	DA (1)25	3		synthetic 4	5		7
	δC	δC b	HMBC	δC	δC b	HMBC	δC b	HMBC
2	67.1	67.5	5β, 6a, 6b,	62.7	66.6	5β, 6b,	66.7	3, 5, 6a, 6b
3	44.6	43.3	2, 4, 5α, 5β, 6a, 6b	27.4	44.4	2, 4, 5β, 6b	68.5	2, 6a, 6b
4	42.7	49.0	5α, 5β, 6a, 6b, 2′, 8′	115.9	42.7	2, 5α, 5β, 6b, 8′	115.8	5, 2′, 8′
5	49.1	47.9	2, 3, 4	46.1	48.4	3	46.0	2, 4
6	35.4	34.8	2, 3, 4	32.2	35.2	2, 3	41.3	2
7	177.5	175.7	3, 6	177.7	176.0	6a, 6b	175.3	3, 6a, 6b
8	174.9	173.4	2, 3	173.6	173.3	2, 3	172.0	2
1′	133.8	131.2	4, 5α, 5β, 3′, 8′	148.3	133.8	3′a, 3′b, 8′	148.2	5, 2′, 8′
2′	132.8	128.7	4, 3′, 8′	41.5	131.8	3′a, 3′b, 4′, 8′	41.3	4, 3′, 8′
3′	128.6	28.5	2′, 4′	28.0	28.0	2′, 4′	27.8	2′, 4′, 5′
4′	135.2	123.8	2′, 3′, 6′, 7′	125.5	124.5	2′, 3′a, 3′b, 6′, 7′	125.2	2′, 3′, 6′, 7′
5′	44.9	133.4	3′, 6′, 7′	133.8	136.8	3′a, 3′b, 6′, 7′	133.5	3′, 6′, 7′
6′	18.6	18.4	4′, 7′	18.6	13.8	4′, 7′	18.5	4′, 7′
7′	23.5	26.4	4′, 6′	26.7	68.9	4′, 6′	26.5	4′, 6′
8′	181.9	17.5	2′, 4	17.5	22.6	2′	17.3	4, 2′

^aSpectra were measured at 151 MHz in CD₃OD.

^bChemical shifts were roughly determined based on the cross peaks in HMBC spectra.