Table 2. ¹H (600 MHz) and ¹³C (100 MHz) NMR Data for Compounds 3–5 in DMSO-d₆.

	3		4		5
no.	δC	δH, mult. (J in Hz)	δC	δH, mult. (J in Hz)	δC	δH, mult. (J in Hz)
1	198.9, C		201.5, C		203.2, C
2	89.1, CH	5.42, s	93.5, CH	5.41, s	93.1, CH	5.58, s
3	168.4, C		166.7, C		168.0, C
4	55.2, CH	3.71, qd (6.7, 3.7)	62.9, CH	3.76, qd (6.9, 3.3)	62.0, CH	4.40, ddd (6.7, 2.2, 1.4)
5	32.7, CH2	1.91, m; 1.74, m	87.0, CH	3.92, brs	128.0, CH	5.74, dd (6.0, 2.2)
6	32.0, CH2	1.82, m; 1.71, m	77.3, CH	3.70, brs	133.9, CH	5.67, dd (6.0, 1.4)
7	95.3, C		78.4, C		80.2, C
8	22.0, CH3	1.30, d (6.6)	23.2, CH3	1.31, s	24.8, CH3	1.22, s
9			16.4, CH3	1.20, d (6.9)	17.9, CH3	1.19, d (6.6)
1′	164.7, C		163.9, C		164.0, C
2′	117.9, CH	6.13, m	117.7, CH	5.99, m	117.5, CH	5.98, m
3′	156.5, C		156.0, C		156.6, C
4′	27.3, CH3	1.90, d (1.2)	27.3, CH3	1.89, d (1.3)	27.3, CH3	1.90, d (1.2)
5′	20.1, CH3	2.13, d (1.2)	20.0, CH3	2.14, d (1.3)	20.0, CH3	2.15, d (1.2)
NH		9.90, s		10.31, s		10.49, s