Table 1.

Correlated ¹H-NMR and COSY spectral data (CD₃OD) of isatinone A (1) and isatinone B (2).

1			2
C/H	δ H	1H-1H COSY	C/H	δ H	1H-1H COSY
1	12.7 (1H, s)		1	12.7 (1H, s)
2			2
3			3
3a			3a
4	7.54 (1H, dd, 7.9, 1.5)	H-5, H-6	4	7.20 (1H, dd, 8.0, 1.5)	H-5, H-6
5	7.08 (1H, ddd, 7.9, 7.1, 1.0)	H-4, H-6	5	7.08 (1H, ddd, 8.0,7.0, 1.5)	H-4, H-6
6	7.19 (1H, ddd, 8.4, 7.1, 1.5)	H-5, H-7	6	7.61 (1H, ddd, 8.4, 7.0, 1.5)	H-5, H-7
7	6.86 (1H, dd, 8.4, 1.0)	H-6, H-5	7	6.89 (1H, dd, 8.4, 1.5)	H-6, H-5
7a			7a
1'			1'
2'			2'
3'	7.02 (1H, m)	H-4', H-5'	3'	7.64 (1H, m)	H-4', H-5'
4'	7.34 (1H, m)	H-3', H-5'	4'	7.36 (1H, m)	H-3', H-5'
5'	7.35 (1H, m)	H-4', H-6'	5'	7.36 (1H, m)	H-4', H-6'
6'	7.34 (1H, m)	H-5', H-7'	6'	7.36 (1H, m)	H-5', H-7'
7'	7.02 (1H, m)	H-6', H-5'	7'	7.64 (1H, m)	H-6', H-5'
OCH3	3.87 (1H, s)		1''
			2''	7.06 (1H, d, 8.2)	H-3''
			3''	6.49 (1H, d, 8.2)	H-2''
			4''
			5''	6.49 (1H, d, 8.2)	H-6''
			6''	7.06 (1H, d, 8.2)	H-5''
			7''	3.41 (2H, s)
			8''
			1'''	4.20 (2H, m)	H-2'''
			2'''	1.70 (1H, m)	H-1''', H-3''', H-1''''
			3'''	1.65 (2H, m)	H-2''', H-4'''
			4'''	1.54 (2H, m)	H-3''', H-5'''
			5'''	1.31 (2H, m)	H-4''', H-6'''
			6'''	0.83 (3H, t, 6.4)	H-5'''
			1''''	1.33 (2H, m)	H-2''', H-2''''
			2''''	0.90 (3H, t, 6.3)	H-1''''