Table 2.

¹³C (125 MHz) and ¹H-NMR (500 MHz) spectroscopic data (DMSO-d₆, δ in ppm) of compounds 3, 4.

	3		4
No.	δC, type	δH (J in Hz)	δC, type	δH (J in Hz)
1	174.3, C	-	175.9, C	-
2-NH	-	7.89, s	-	7.57, s
3	53.9, CH	3.16, m	53.8, CH	3.14, q (4.9)
4	50.5, CH	2.02, t (4.1)	50.9, CH	2.47, t (4.4)
5	34.1, CH	2.18, m*	34.3, CH	2.3, m
6	137.3, C	-	137.1, C	-
7	126.8, CH	5.21*	127.4, CH	5.17, br s
8	42.3, CH	3.06 br d (9.9)	40.9, CH	3.04, br d (9.8)
9	55.5, C	-	57.2, C	-
10	44.0, CH2	2.59, dd (13.2, 7.4) 2.74, dd (13.1, 5.3)	43.6, CH2	2.65, dd (13.6, 5.2) 2.70, dd (13.6, 5.2)
11	12.8, CH3	0.64, d (7.2)	13.0, CH3	0.84, d (7.3)
12	19.2, CH3	1.62, s	19.3, CH3	1.63, s
13	129.2, CH	5.73, dd (15.7, 10.1)	129.7, CH	5.66, dd (15.3, 10.1)
14	133.5, CH	5.08, ddd (15.3, 10.9, 4.5)	132.8, CH	5.02, ddd (15.3, 11.0, 4.4)
15	42.1, CH2	1.57, m* 1.89, br dd (12.4, 4.3)	42.3, CH2	1.52, q (12.5) 1.84, br dd (12.5, 4.2)
16	27.6, CH	1.69, m	27.7, CH	1.69, m
17	53.1, CH	1.37, br dd (13.6, 3.2) 1.59, m*	53.1, CH2	1.34, br dd (13.4, 3.3) 1.60, dd (13.6, 3.3)
18	72.1, C	-	72.2, C	-
19	137.3, CH	5.36, dd (16.6, 2.3)	136.2, CH	5.61, dd (16.7, 2.4)
20	125.1, CH	5.71, dd (16.9, 2.4)	130.7, CH	5.76, dd (16.7, 2.4)
21	75.7, CH	5.23*	73.7, CH	3.63, br s
22	25.8, CH3	0.94, d (7.3)	25.9, CH3	0.93, d (7.1)
23	31.0, CH3	1.13, s	31.5, CH3	1.12, s
24	169.3, C	-	-	-
25	20.2, CH3	2.18, s	-	-
1´	136.8, C	-	136.9, C	-
2´/6´	129.6, CH (x2)	7.12, d (7.0)	129.8, CH (x2)	7.21*
3´/5´	127.9, CH (x2)	7.29, t (7.5)	127.7, CH (x2)	7.29, t (7.7)
4´	126.0, CH	7.21, t (7.5)	126.0, CH	7.21*
18-OH	-	4.36, s	-	4.17, s
21-OH	-	-	-	4.88, br d (5.6)

*overlapping signals, assignments were supported by HSQC and HMBC