Table 4. ¹H NMR (500 MHz, coupling constant J in Hz in parentheses, CD₃OD) data of iridoids 7-11 .

Chemical shift dH in ppm
Position	7	8	9	10	11
1	5.61 d (2.6)	5.38 s	5.89 s	5.85 s	5.95 s
2	-	-	-	-	-
3	7.44 d (0.9)	7.46 s	7.54 s	7.59 s	7.48 d (1.3)
4	-	-	-	-	-
5	3.04 dd (10.1, 2.9)	-	-	-	3.11 dd (9.0, 1.4)
6	4.08 m	4.18 d (4.5)	3.78 d (9.7)	4.32 t (4.47)	4.37 m
7a	1.86 dd (13.2, 6.0)	3.66 d (4.5)	4.08 d (9.7)	1.52 m	2.05 dd (14.9, 5.3)
7b	2.06 dd (13.2, 6.4)	-	-	1.83 m	2.24 d (15.0)
8	-	-	-	2.54-2.70*	-
9	2.65 dd (10.2, 2.5)	2.51 s	2.56 s	2.54-2.70*	3.03 dd (9.0, 2.1)
10	1.30 s	1.39 s	1.16 s	0.98 d (6.9)	1.55 s
11	-	-	-	-	-
11-OMe	3.77 s	3.73 s	3.78 s	3.76 s	3.75 s
Me-COO	-	-	-	-	2.05 s
1’	3.67 (d (7.8)	4.61 d (8.0)	4.64 d (7.8)	4.61 d (7.7)	4.67d (7.8)
2’	3.20 t (8.3)	3.20 t (8.5)	3.23 t (8.8)	3.22 dd (8.9, 7.9)	3.21 t (8.4)
3’	3.36-3.44*	3.35-3.38*	3.36-3.47*	.3.36-3.46*	3.36-3.45*
4’	3.25-3.34*	3.22-3.31*	3.27-3.35*	3.22-3.35*	3.25-3.35*
5’	3.33-3.40*	3.31-3.36*	3.32-3.39*	3.33-3.39*	3.33-3.40*
6’a	3.68 dd (12.0, 5.7)	3.66-3.71*	3.70 dd (11.9, 5.5)	3.69 dd (12.0, 5.8)	3.64-3.75*
6’b	3.94 dd (11.9, 1.6)	3.90 d (12.0)	3.94 dd (11.9, 1.6)	3.95 dd (11.9, 1.8)	3.90-3.96*