`CH_3-UNDERSET(H)underset(|)C=N-H``CH_3- underset(CH_3)underset(|)C="NN"HCONH_2``CH_3-underset(H)underset (|)C=N-NH-CO-NH_2` `CH_3underset(CH_3)underset(|) C=N-NH-C_6H_3(NO_2)_2`
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