Table 2.

¹³C-NMR Spectroscopic Data of Compounds 1–4^a.

1		2		3		4
Position	δc, Type	Position	δc, Type	Position	δc, Type	Position	δc, Type
1	29.5, C	1	27.1, CH3	2	74.2, CH	1	120.0, C
2	43.2, CH2	2	198.3, CH	3	29.9, CH2	2	155.3, C
3	70.4, CH	3	129.9, CH	4	25.8, CH2	3	105.5 b, CH
4	132.4, CH	4	139.4, CH	5	128.5, CH	4	131.0, CH
5	130.7, C	5	122.3, CH	6	109.7, CH	5	109.4 b, CH
6	52.3, CH	6	153.1, C	7	153.0, C	6	155.4, C
7	76.8, CH	7	74.7, CH	8	109.3, C	7	165.8, C
8	129.8, CH	8	33.3, CH2	4a	114.4, C	1′	136.2, C
9	138.8, C	9	27.5, CH2	8a	154.5, C	2′, 6′	127.8, CH
10	140.0, CH	10	135.3, C	1′	122.4, C	3′, 5′	128.3, CH
11	115.6, CH2	11	124.0, CH	2′	156.1, C	4′	127.8, CH
12	21.0, CH3	12	21.8, CH2	3′	102.1, CH	7′	66.0, CH2
13	28.9, CH3	13	43.1, CH2	4′	161.4, C	1”	100.4, CH
14	168.8, C	14	208.1, C	5′	105.7, CH	2”	73.27, CH
15	12.3, CH3	15	29.8, CH3	6′	128.0, CH	3”	75.6, CH
1′	102.7, CH	16	13.4, CH3	2”	77.4, C	4”	70.0, CH
2′	73.5, CH	17	23.2, CH3	3”	70.5, CH	5”	76.8, CH
3′	76.8, CH			4”	27.3, CH2	6”	67.8, CH2
4′	70.1, CH			5′′	20.8	1′′′	109.4, CH
5′	76.9, CH			6′′	25.8	2′”	75.9, CH
6′	61.2, CH2 b 4.29, dd, (11.5, 6)			-OMe	55.7	3′′′	78.7, C
						4′′′	73.30, CH2
						5′′′	63.2, CH2

^{a 1}H NMR data (δ) were measured at 125 MHz in DMSO-d₆ for 1, 2, 4, and at 150 MHz in methanol-d₄ for 3. The assignments were based on HSQC and HMBC experiments; ^b interchangeable.