Table 2. ¹H (600 MHz) and ¹³C (150 MHz) NMR data of compounds 4–6.

Position	4a		5a		6a
	δ C, type	δ H (J in Hz)	δ C, type	δ H (J in Hz)	δ C, type	δ H (J in Hz)
1	137.0, C	—	142.2, C	—	140.7, C	—
2	121.3, C	—	120.3, C	—	125.8, C	—
3	154.8, C	—	158.1, C	—	157.4, C	—
4	118.5, C	—	98.8, CH	6.51 s	122.0, C	—
5	158.1, C	—	155.5, C	—	153.8, C	—
6	101.5, CH	6.85 s	119.5, C	—	124.7, C	—
3-OCH3	—	—	55.9, CH3	3.77 s	62.2, CH3	3.49 s
5-OCH3	56.1, CH3	3.84 s	—	—	—	—
5′-OCH3	—	—	56.2, CH3	3.68 s	—	—
a	128.4, CH	7.33 d (16.2)	128.8, CH	6.87 d (16.8)	128.2, CH	6.83 d (16.8)
a′	130.5, CH	6.96 d (16.2)	130.4, CH	6.49 d (16.8)	130.5, CH	6.58 d (16.8)
a″	31.5, CH2	4.07 s, 2H	32.3, CH2	3.90 s, 2H	33.1, CH2	3.99 s, 2H
a‴	29.1, CH2	3.95 s, 2H	32.4, CH2	3.93 s, 2H	30.1, CH2	4.04 s, 2H
a′′′′	—	—	—	—	33.1, CH2	4.03 s, 2H
1′	139.2, C	—	126.3, C	—	125.9, C	—
2′	127.4, CH	7.40 d (7.8)	150.2, C	—	156.1, C	—
3′	129.6, CH	7.29 t (7.8)	117.4, CH	6.66 dd (9.0, 1.2)	116.5, CH	6.72 dd (7.8, 1.2)
4′	128.4, CH	7.19 m	115.5, CH	6.61 m	129.2, CH	7.00 td (7.8, 1.2)
5′	129.6, CH	7.29 t (7.8)	154.3, C	—	120.5, CH	6.70 m
6′	127.4, CH	7.40 d (7.8)	112.3, CH	6.62 m	128.0, CH	7.05 m
1″	133.7, C	—	134.6, C	—	134.2, C	—
2″/6″	130.2, CH	6.98 d (8.4)	130.2, CH	6.87 d (8.4)	130.3, CH	6.86 d (8.4)
3″/5″	116.0, CH	6.65 d (8.4)	115.7, CH	6.59 d (8.4)	115.8, CH	6.61 d (8.4)
4″	156.2, C	—	155.8, C	—	156.0, C	—
1‴	133.6, C	—	134.5, C	—	133.4, C	—
2‴/6‴	130.3, CH	7.03 d (8.4)	130.4, CH	6.94 d (8.4)	130.2, CH	7.04 d (8.4)
3‴/5‴	115.8, CH	6.63 d (8.4)	115.7, CH	6.61 d (8.4)	115.9, CH	6.67 d (8.4)
4‴	156.1, C	—	155.8, C	—	156.3, C	—
1′′′′					133.6, C	—
2′′′′/6′′′′					130.3, CH	6.91 d (8.4)
3′′′′/5′′′′					115.9, CH	6.63 d (8.4)
4′′′′					156.0, C	—

^aData were measured in CD₃OD.