Table 4. NMR Spectroscopic Data (¹H at 800 MHz, ¹³C at 200 MHz, CDCl₃) for 3″-Hydroxyisochamanetin (4).

position	δC, type	δH	J (Hz)	HMBC, H→C
2	79.4, C–O	5.38	dd, (13.1, 2.8)	C-3, C-4, C-8a, C-1′, C-2′/6′
3	43.3, CH2	3.08	dd, (17.2, 13.1)	C-2, C-4, C-1′
				C4, C10, C1′
		2.84	dd, (17.2, 2.8)	C-4a, C-4, C-1′
4	196.3, C=O
4a	103.1, C
5	160.7, C–O
OH-5		12.89	s	C-5, C-6, C-4a
6	108.2, C
7	163.0, C–O
8	96.3, CH	6.03	s	C-4, C-4a, C-6, C-7, C-8a
8a	161.4, C–O
1′	138.3, C
2′/6′	126.3, CH	7.42a	m	C-2, C-1′, C-2′/6′, C-3′/5′, C-4′
3′5′	129.0, CH	7.42a	m	C-2, C-1′, C-2′/6′, C-3′/5′, C-4′
4′	129.1, CH	7.38	m	C-1′, C-2′/6′, C-3′/5′
1″	126.8, C
2″	141.2, C–O
3″	144.3, C–O
4″	113.2, CH	6.74a	d (4.8)	C-2″, C-6″
5″	123.1, CH	7.05	dd, (4.8, 4.8)	C-1″, C-3″, C-4″, C-6″
6″	121.1, CH	6.74a	d (4.8)	C-1″, C-2″, C-4″, C-5″, C-7″
7″	22.1, CH2	3.87	AB d (14.5)	C-7, C-6, C-5, C-1″, C-2″, C-6″

^aOverlapping signals.