Table 3.

NMR ¹H spectra of 14a–14f (DMSO-d6, δ).

№	14a	14b	14c	14d	14e	14f
H-2	s 8.00	s 8.01	s 8.01	s 8.00	s 8.01	s 8.01
H-5	m 7.00–7.15	m 7.08–7.30	d 7.09 (J = 8.7 Hz)	d 7.07 (J = 8.6 Hz)	d 7.01 (J = 8.6 Hz)	d 7.01 (J = 8.6 Hz)
H-6	m 7.72	m 7.75	m 7.77	m 7.72	m 7.75	m 7.77
H-7	s 3.86	s 3.86	s 3.85	s 3.85	s 3.86	s 3.86
H-8	s 8.12	s 8.13	s 8.16	s 8.14	s 8.13	s 8.15
H-9	s 5.00	s 5.09	s 5.09	s 5.02	s 5.04	s 5.09
H-11	m 7.00–7.15	m 7.08–7.30		t 7.35 (J = 9.1 Hz)
H-12	m 7.00–7.15		m 7.21		m 6.77	m 7.42
H-13		m 7.08–7.30	m 7.28
H-14	m 7.00–7.15	m 7.08–7.30	t 7.11 (J = 7.7 Hz)	m 7.27	m 6.77	m 7.28
H-15	m 7.00–7.15	m 6.95	m 6.95	m 7.02	m 6.77	m 7.17
NH	s 11.32	s 11.33	s 11.35	s 11.34	s 11.33	s 11.33
NH2	m 7.90	m 7.89	m 7.90	m 7.92	m 7.93	m 7.87