Table 3.

Summary of NMR data

Chemical shift δ (p.p.m.)Coupling constant J (Hz)
6.80 8.5 
6.73 Broadened singlet 
6.68 8.5, ∼1 
4.15 4.5, 9.5 
2.96 4.5, 16.5 
2.77 9.5, 16.5 
Chemical shift δ (p.p.m.)Coupling constant J (Hz)
6.80 8.5 
6.73 Broadened singlet 
6.68 8.5, ∼1 
4.15 4.5, 9.5 
2.96 4.5, 16.5 
2.77 9.5, 16.5 
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