Table 1.

¹H (500 MHz) and ¹³C (125 MHz) NMR Data of Compounds 1 and 2 in DMSO-d₆

	1		2
position	δC, type	δH (J in Hz)	δC, type	δH (J in Hz)
1 NH		10.27, s		10.35, s
2	170.2, C		171. 5, C
3 NH		10.53, s		10.53, s
4	53.7, CH	5.67, dd (12.0, 8.7)	53.7, CH	5.61, dd (12.0, 8.3)
5 Ha	50.8, CH2	3.84, dd (11.8, 8.7)	50.8, CH2	3.80, dd (11.5, 8.3)
Hb		4.31, dd (12.0, 11.8)		4.31, dd (12.0, 11.5)
6	32.3, CH	5.94, s	61.9, CH	5.94, d (3.9)
1′ NH		11.35, d (2.6)		11.46, d (2.6)
2′	126.1, CH	7.22, d (2.6)	126.2, CH	7.51, d (2.6)
3′	109.9, C		111.9, C
3a′	125.0, C		124.1, C
4′	120.1, CH	7.54, d (8.5)	120.9, CH	7.66, d (8.6)
5′	122.1, CH	7.20, dd (8.5, 1.8)	122.1, CH	7.16, dd (8.6, 1.7)
6′	114.5, C		114.5, C
7′	114.5, CH	7.63, d (1.8)	114.5, CH	7.64, d (1.7)
7a′	137.3, C		137.3, C
1″ NH		11.35, d (2.6)		11.40, d (2.6)
2″	125.6, CH	7.43, d (2.6)	125.4, CH	7.46, d (2.6)
3″	112.8, C		113.0, C
3a″	123.6, C		123.6, C
4″	120.0, CH	6.83, dd (8.5, 1.7)	120.1, CH	7.19, d (8.5)
5″	121.7, CH	7.02, d (8.5)	121.8, CH	6.98, dd (8.5, 1.8)
6″	114.4, C		114.5, C
7″	114.6, CH	7.57, d (1.7)	114.6, CH	7.61, d (1.8)
7a″	137.6, C		137.6, C
6 OH				6.80, d (3.9)
1‴ NH		11.43, d (2.6)
2‴	126.0, CH	7.41, d (2.6)
3‴	109.8, C
3a‴	124.9, C
4‴	120.1, CH	7.46, d (8.6)
5‴	122.1, CH	7.17, dd (8.6, 1.8)
6‴	114.5, C
7‴	114.5, CH	7.65, d (1.8)
7a‴	137.2, C