Table 4.

The ¹H and ¹³C NMR (DMSO-d₆, 500.13 and 125.4 MHz) and HMBC assignment for 5.

Position	δC, Type	δH, (J in Hz)	HMBC
2	158.9, CH	8.73, s	C-3, 4, 8a, 10
3	117.4, C	-	-
4	173.4, CO	-	-
4a	112.0, C	-	-
5	*	-	-
6	143.2, C	-	-
7	157.1	-	-
8	104.0, CH	7.03, s	-
8a	152.8, C	-	-
9	167.1, CO	-	-
10	134.9, CH	7.35, s	2, 4, 12
11	128.7, CH	7.35, s	3
12	198.2, CO	-	-
13	17.5, CH3	2.29, s	11, 12
OCH3-6	61.0, CH3	3.75, s	6

* not observed.