¹³C NMR data (100 MHz) of compounds 5–9^a.

Position	5b	6b	7b	8c	9b
1	144.0	147.9	154.3	150.6	150.0
1a	119.0	127.1	110.4	115.3	129.8
1b	126.5	129.0	123.3	119.9	133.8
2	148.9	153.1	148.3	147.7	145.4
3	107.6	117.6	102.7	143.7	123.8
3a	127.5	128.5	137.9	132.6	131.9
4	29.7	27.7	125.8	107.9	31.4
5	55.0	43.4	144.9	156.6	43.5
6a	63.9	54.9	147.1	132.6	52.7
7	27.5	36.1	184.1	174.7	35.0
7a	123.3	135.7	126.3	126.9	138.4
8	143.5	129.6	152.0	108.1	129.9
9	146.6	129.6	157.9	150.8	129.7
10	114.5	129.1	126.3	113.4	129.5
11	120.7	129.9	125.9	123.0	128.7
11a	124.6	133.2	124.9	120.3	132.7
OCH2O	102.4		104.4	102.8
1-OCH3		61.7			61.3
3-OCH3				61.3
5-OCH3				56.2
8-OCH3			61.7
9-OCH3				56.2
					22.7
					171.4
N–CH3	44.0
					21.1
					172.5
1′		103.0
2′		75.4
3′		78.8
4′		71.9
5′		78.8
6′		63.1

^aAssignments were based on ¹H–¹H COSY, HMQC, HMBC, and NOESY experiments; chemical shifts (δ) are given in ppm.

^bRecorded in CDCl₃.

^cRecorded in CD₃OD.