Table 2.

The ¹H and ¹³C NMR of 3a (DMSO-d₆, 300.13 and 75.4 MHz) and 3b (DMSO, 500.13 and 125.4 MHz).

3a			3b
Position	δC, Type	δH, (J in Hz)	δC, Type	δH, (J in Hz)
1	28.4, CH3	1.45, s	22.4, CH3	1.44, s
2	94.2, C	-	97.7, C	-
3	37.5, CH2	2.55, d (17.5)	37.1, CH2	2.63, dd (17.6, 2.6)
		2.87, d (17.5)		2.96, dd (17.6, 2.6)
4	158.7, C	-	157.9, C	-
5	113.5, C	-	113.0, C	-
6	56.3, CH2	4.45, s	52.7, CH2	4.22, dt (14.9, 0.9)
		-		4.52, dd (14.9, 2.1)
7	173.4, CO	-	173.2, CO	-
8	115.4, C	-	115.4, C	-
9	152.1, C	-	152.1, C	-
10	102.7, CH	6.83, s	102.7, CH	6.83, s
11	150.8, C	-	150.8, C	-
12	144.3, C	-	144.4, C	-
13	107.4, CH	7.26, s	107.4, CH	7.26, s
OCH3	-	-	48.3, CH3	3.21, s