Table 1.

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

	1	2	4		3
Position	δH	δH	δH	Position	δH
1	-	-	-	1	-
2	6.26 br s	6.28 br s	6.18 br s	2	6.16 br s
3	-	-	-	3	-
4	6.32 br s	6.33 br s	6.26 br s	4	6.28 br s
5	-	-	-	5	-
6	-	-	-	6	-
7	3.16 t J = 6.0	3.18 t J = 6.0	3.20 t J = 6.0	7	3.18 t J = 6.0
8	2.79 m	2.80 m	2.80 m	8	2.86 m
9	-	-	-	9	-
10,14	7.11 d J = 8.5	7.12 d J = 8.5	7.10 d J = 8.5	10,14	7.14 d J = 8.5
11,13	6.82 d J = 8.5	6.82 d J = 8.5	6.83 d J = 8.5	11,13	6.83 d J = 8.5
12	-	-	-	12	-
-OMe	3.80 s	3.81 s	3.74 s	-OMe	3.76 s
COOH	-	-	-	COOH	-
MeCO-		1.95 s	-	MeCO-
MeCO-		-	-	MeCO-
1’			-	1’	-
2’			6.16 br s	2’	6.18 br s
3’			-	3’	-
4’			6.28 br s	4’	6.26 br s
5’			-	5’	-
6’			-	6’	6.24 br s
7’			3.18 t J = 6.0	7’	3.20 t J = 6.0
8’			2.86 m	8’	2.82 m
9’			-	9’	-
10’, 14’			7.15 d J = 8.5	10’, 14’	7.09 d J = 8.5
11’, 13’			6.83 d J = 8.5	11’,13’	6.81 d J = 8.5
12’			-	12’	-
-OMe			3.76 s	-OMe	3.76 s
COOH			-
1’’			-
2’’			6.14 br s
3’’			-
4’’			6.23 br s
5’’			-
6’’			-
7’’			3.18 t J = 6.0
8’’			2.80 m
9’’			-
10’’, 13’’			7.08 d J = 8.5
11’’, 14’’			6.85d J = 8.5
12’’			-
-OMe			3.77 s
-OMe			3.76 s
COOH			-

^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.