Three New Steroidal Glycosides from the Roots of Cynanchum stauntonii

Table 2

The ¹³C and DEPT NMR chemical shifts of compounds 1–3 in C₅D₅N.

(a)  

C	Aglycon moiety
	1 ^a	2 ^a	3 ^b
1	36.5 t	36.5 t	33.6 t
2	30.0 t	30.0 t	27.8 t
3	78.2 d	78.2 d	75.4 d
4	39.1 t	39.0 t	125.2 d
5	140.6 s	140.6 s	144.5 s
6	120.4 d	120.4 d	125.7 d
7	30.0 t	30.0 t	122.6 d
8	40.7 d	40.7 d	108.2 s
9	53.2 d	53.2 d	44.2 d
10	38.7 s	38.7 s	35.6 s
11	23.9 t	23.9 t	20.5 t
12	28.4 t	28.4 t	30.8 t
13	118.5 s	118.5 s	54.9 s
14	175.5 s	175.5 s	155.3 s
15	67.8 t	67.8 t	72.1 t
16	75.5 d	75.5 d	86.2 d
17	56.2 d	56.2 d	62.1 d
18	143.8 d	143.8 d	77.5 t
19	17.8 q	17.8 q	17.7 q
20	114.4 s	114.4 s	118.5 s
21	24.8 q	24.8 q	22.7 q

(b)  

C	Sugar moiety
	1 ^a	2 ^a	3 ^b
	β-D-the	β-D-the	β-D-the
1′	102.3 d	102.3 d	103.5 d
2′	74.6 d	74.6 d	75.1 d
3′	85.8 d	85.8 d	88.2 d
4′	82.9 d	82.9 d	76.0 d
5′	71.6 d	71.6 d	72.8 d
6′	18.7 q	18.7 q	18.7 q
3′-OCH3	60.5 q	60.5 q	61.0 q
	β-D-digt	β-D-digt
1′′	99.0 d	99.0 d
2′′	39.0 t	39.1 t
3′′	67.7 d	67.7 d
4′′	83.2 d	83.2 d
5′′	68.8 d	68.8 d
6′′	18.5 q	18.5 q*
	β-D-cym	β-D-cym
1′′′	99.8 d	99.6 d
2′′′	35.6 t	34.9 t
3′′′	78.8 d	77.4 d
4′′′	74.1 d	82.3 d
5′′′	71.0 d	69.3 d
6′′′	18.9 q	18.6 q
3′′′-OCH3	58.0 q	57.3 q
		α-L-cym
1′′′′		101.2 d
2′′′′		30.9 t
3′′′′		75.8 d
4′′′′		67.5 d
5′′′′		67.7 d
6′′′′		17.8 q*
3′′′′-OCH3		55.0 q

^*not differentiated.
^a125 MHz; ^b150 MHz.
the: thevetopyranosyl; digit: digitoxopyranosyl; cym: cymaropyranosyl.