Table 1.

¹H NMR for compound4b.

1H NMR	1H–1H COSY	Assignment:
11.80 (s, 1H)		NH-4e
11.34 (s, 1H)	5.73	NH-1
8.01 (s, 1H)		H-4 g
7.76 (d, J = 8.2 Hz, 1H)	7.03	H-5
7.72 (d, J = 8.5 Hz, 2H)	7.65	H-o
7.65 (d, J = 8.5 Hz, 2H)	7.72	H-m
7.09 (s; 1H)	2.38	H-8
7.03 (d, J = 8.4 Hz; 1H)	7.81, 7.76	H-6
5.74 (s, 1H)	11.34	H-3
5.33 (s, 2H)		H-4c
2.38 (s; 3H)	7.09	H-7a