Table 2.

¹H and ¹³C NMR (DMSO-d₆, 300.13 and 75.4 MHz) and HMBC assignment for 2.

Position	δC, Type	δH (J in Hz)	COSY	HMBC
2	152.6, C	-
3	101.0, CH	6.47, brs	CH3-9	C-2,4,8
4	134.7, C
5	109.3, CH	6.70, s	H2-10	C-6,7,8a,10
6	154.4, C	-
7	95.6, CH	6.70, s		C-6,8a
8	155.0, C	-
8a	118.4, C	-
9	13.7, CH3	2.36, d (1.0)		C-2,3
10	61.0, CH2	4.58, d (5.6)	H-5, OH-6	C-4,5,8a
OH-6	-	9.28, s		C-5,6,7
OH-10	-	5.17, t (5.6)	H2-10	C-10