Table 1.

¹H-NMR data of Nepetamoside ^a (1), 6β-dihydrocornic acid (12) ^b, 6α-dihydrocornic acid (13) ^b, penstemonoside (14) ^c and 8-deoxyshanzhiside (15) ^c.

C	1	12	13	14	15
1	5.39 br s	5.25 d (5)	5.21 d (9)	5.58 d (2.5)	5.44 d (2)
3	7.41 s	7.41 s	7.62 s	7.48 d (0.9)	7.34 s
4	-	-	-	-	-
5	2.85 t (8.5)	2.79 t (6)	2.82 dd (4, 9)	2.88 br d	2.70 d (9)
6	4.19 br s	4.05 m	4.47 t (4)	4.23 m	4.11 t (2)
7	1.40 ddd (4.6, 10.2, 13.7) 1.76 dd (7, 13.1)	1.25 m 2.17 m	1.38 ddd (4, 10, 13) 1.92 dd (8, 13)	1.80 m 1.50 ddd (4.2, 9.8, 14)	1.38 ddd (4, 10, 13) 1.65 dd (8, 13)
8	2.58 m	1.96 q (7)	2.30 m	2.58 m	2.43 m
9	2.80 m	2.03 dt (5, 6, 7)	1.70 dt (4, 8)	2.71 td (2.5, 9.3, 11.7)	2.56 dt (2, 9.2, 9,2)
10	1.05 d (7.2)	1.15 d (7)	1.12 d (8)	1.02 d (7.2)	0.87 d (7)
11	-	-	-	-	-
OMe	3.71 s	-	-	3.75 s	-
Glc
1′	4.56 d (7.9)	4.65 d (8)	4.70 d (8)	4.76 d (8.1)	4.63 d (8)
2′	3.20 t (8.2)	3.20 t (8)	3.24 dd (8, 9)	3.25 dd (8.1, 9.3)	3.10 t (9)
3′	3.35 ovl	3.37 m	3.40 t (9)	3.30-3.51 m	3.33 t (9)
4′	3.31 ovl	3.37 m	3.31 m	3.30-3.51 m	3.23 t (9)
5′	3.29 ovl	3.30 m	3.29 m	3.30-3.51 m	3.33 t (9)
6′	3.68 dd (4, 11.8) 3.84 d (11.8)	3.67 dd (6, 12) 3.89 dd (2, 12)	3.67 dd (6, 12) 3.86 dd (2, 12)	3.72 dd (5.7, 12.3) 3.92 dd (2, 12.3)	3.62 dd (6, 12) 3.77 d (12)

^a Acquired in CD₃OD at 400 MHz; Coupling constants (J in Hz) in parentheses; ¹H and ¹³C assignments aided by ¹H-¹H COSY, HSQC, and HMBC experiments. ovl: overlapped with other signals. ^b In CD₃OD as previously reported [28]. ^c In D₂O as previously reported [25,28].