Table 1.

¹H and ¹³C NMR data of compounds 1 and 2.

No.	Compound 1 (DMSO-d6)		Compound 2 (DMSO-d6)
	δH (Mult, J in Hz) a	δC, Type b	δH (Mult, J in Hz) a	δC, Type c
1		172.1, C		180.2, C
2	3.79, ddd (10.1, 8.3, 5.1)	49.4, CH	3.67, m	51.0, CH
3	2.32, dd (14.1, 5.1) 2.24, dd (14.1, 10.1)	32.4, CH2	2.39, d (13.0) 2.14, dd (14.6,11.8)	33.4, CH2
4		56.1, C		56.3, C
5		129.5, C		130.0, C
6	6.57, d (7.7)	116.7, CH	6.57, d (7.7)	116.9, CH
7	6.79, t (7.7)	121.1, CH	6.75, t (7.7)	120.9, CH
8	6.70, d (7.7)	115.1, CH	6.65, d (7.7)	115.0, CH
9		141.0, C		141.0, C
10		130.5, C		130.5, C
12		179.3, C		180.2, C
13		41.8, C		41.7, C
14	6.04, dd (17.4, 10.9)	143.2, CH	6.03, dd (17.0, 11.0)	143.6, CH
15	5.08, d (10.9) 4.97, d (17.4)	113.5, CH2	5.02, d (11.0) 4.93, d (17.0)	113.1, CH2
16	1.02, s	21.7, CH3	1.01, s	21.8, CH3
17	0.94, s	21.4, CH3	0.93, s	21.6, CH3
1′		173.0, C		172.6, C
2′	3.90, ddd (9.6, 6.0, 3.1)	72.1, CH	3.76, d (10.5)	72.9, CH
3′	2.79, dd (13.9, 3.1) 2.61, dd (13.9, 9.6)	39.9, CH2	2.77, d (13.5) 2.61, dd (13.5, 10.5)	40.1, CH2
4′		138.9, C		140.0, C
5′/9′	7.22, d (7.2)	129.4, CH	7.26, m	129.4, CH
6′/8′	7.26, t (7.2)	127.8, CH	7.26, m	127.9, CH
7′	7.18, t (7.2)	125.8, CH	7.18, m	125.7, CH
1-OMe	3.38, s	51.7, CH3
9-OH	9.39, s		9.61, br s
11-NH	10.15, s		10.05, br s
2′-OH	5.52, d (6.0)		5.45, br s
10′-NH	7.35, d (8.3)		6.86, br s

^a Measured at 500 MHz; ^b Measured at 125 MHz; ^c Measured at 150 MHz.