Assignment of exchangeable imino and amino proton and nitrogen resonances

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• 1D imino proton spectrum
• 2D ¹H-¹⁵N HMQC/HSQC experiment ( 93JMRA241-102 ).
• 2D ¹H-¹³C HMBC experiment ( 00JB175 ) optimized for the 5-9 Hz coupling between imino H1(G) and H3(T) protons and C5(G) and C5(T) nuclei, respectively.