Table 2.

¹H-(500 MHz) and ¹³C (125 MHz) NMR spectroscopic data of 3 and 4 recorded in DMSO-d₆ and 5 recorded in CDCl₃ (ẟ in ppm).

	Compound 3			Compound 4			Compound 5
Position	ẟ C	ẟ H	HMBC	ẟ C	ẟ H	HMBC	ẟ C	ẟ H	HMBC
1a	108.8	-		108.8	-		127.1	-
1	110.3	8.51	2, 3, 12a	110.3	8.51	2, 3, 12a	105.4	8.33	1a, 2, 4a, 12a
2	143.9	-		143.9	-		140.5	-
2-OMe	56.5	3.78	2	56.1	3.79	2	-	-
3	149.8	-		149.7	-		136.4	-
3-OMe	56.1	3.80	3	56.5	3.80	3	-	-
4	102.2	6.73	1a, 2, 3	102.2	6.74	1a, 2, 3	139.4	-
(2/3)-OCH2	-	-		-	-		102.4	6.07	3
4a	143.8	-		143.8	-		127.2	-
4-OMe	-	-		-	-		56.6	3.97	4
6	88.7	6.20	4a, 6a, 12a	88.7	6.20	4a, 6a, 12a	89.2	6.27	4a, 6a
6-OH	-	7.97	6a	-	7.98	6, 6a	-	n. d
6a	155.8	-		155.9	-		154.5	-
7a	156.8	-		156.8	-		156.5	-
8	101.7	7.24	7a, 9, 10, 12	101.7	7.24	7a, 9	100.8	6.89	7a, 9, 10
9	163.6	-		163.6	-		163.5	-
10	116.0	7.13	8, 9, 11a	116.0	7.13	9, 11a	115.7	7.02	8, 11a
11	127.3	8.07	7a, 9, 12	127.4	8.07	7a, 9, 12	127.5	8.17	7a, 9, 12
11a	117.8	-		117.8	-		118.0	-
12	174.8	-		174.8	-		175.4	-
12a	110.1	-		110.1	-		110.7	-
1′	66.0	4.73	9, 2′, 3′	65.7	4.75	9, 2′	65.7	4.69	9, 2′, 3′
2′	119.5	5.50	1′, 3′-Me, 3′	119.4	5.51	1′, 3′	119.3	5.54	3′-Me, 4′
3′	141.4	-		141.4	-		141.2	-
3′-Me	17.0	1.73	2′, 3′, 4′	17.0	1.78	3′	16.8	1.80	2′, 4′, 5′
4′	41.9	2.74	3′-Me, 3′, 5′	41.6	2.74/2.25	3′	42.1	2.83	2′, 3′-Me, 5′, 6′
5′	122.6	5.53	4′, 7′	53.8	2.96	4′	140.5	5.71	4′, 7′, 8′
6′	142.0	5.61	4′, 5′, 7′, 8′	64.8	2.67	7′	123.9	5.66	4′, 7′
7′	69.3	-		67.6	-		70.8	-
8′	30.5	1.17	6′, 7′, 8′	26.8	1.07	7′, 8′	29.8	1.34	5′,7′, 8′
8′-Me	30.5	1.17	6′, 7′, 8′	30.5	1.17	8′-Me, 7′	29.8	1.36	5′,7′, 8′
8′-OH	-	4.49	6′, 7′, 8′	-	n. d		-	4.18	7′