Table 2.

¹³C NMR Data of Compounds 1-4 (CD₃OD, 600 MHz in methanol-d₄). ^a

	1	2	4		3
Position	δC	δC	δC	Position	δC
1	149.0	148.7	148.4	1	144.3
2	106.2	107.0	107.0	2	106.6
3	166.0	166.8	162.0	3	162.9
4	101.0	100.1	99.8	4	99.7
5	166.0	165.3	163.0	5	163.8
6	111.2	109.8	112.0	6	109.8
7	36.5	36.2	38.2	7	38.0
8	38.0	37.8	38.4	8	38.6
9	137.5	137.0	136.0	9	135.9
10,14	129.5	129.2	131.0	10,14	130.4
11,13	116.0	115.5	114.8	11,13	114.6
12	156.2	155.2	156.3	12	156.3
-OMe	57.4	57.1	57.1	-OMe	57.3
COOH	175.0	174.6	175.0	COOH	174.0
MeCO-		21.0	-	MeCO-	-
MeCO-		172.0	-	MeCO-	-
1’			147.9	1’	148.5
2’			109.7	2’	111.0
3’			161.5	3’	165.4
4’			100.0	4’	109.7
5’			163.0	5’	161.3
6’			110.8	6’	100.0
7’			38.0	7’	38.1
8’			39.0	8’	39.0
9’			136.9	9’	136.5
10’, 14’			130.0	10’, 14’	131.0
11’, 13’			115.0	11’,13’	114.0
12’			159.0	12’	157.8
-OMe			57.0	-OMe	56.9
COOH			174.5
1’’			148.0
2’’			109.9
3’’			161.0
4’’			99.8
5’’			163.9
6’’			111.0
7’’			37.8
8’’			38.6
9’’			136.5
10’’, 13’’			130.1
11’’, 14’’			114.4
12’’			158.0
-OMe			57.3
-OMe			57.5
COOH			174.5

^a J values are in parentheses and reported in Hz; chemical shifts are given in ppm; assignments were confirmed by DQF-COSY, 1D-TOCSY, HSQC, and HMBC experiments.