![[double bond, length half m-dash]](http://www.rsc.org/images/entities/h2_char_e006.gif)
N bonds of E- and Z-amidines The unstable Z-formamidines are ‘frozen’ in the perpendicular configuration (6); ready isomerisation [via the conjugate acid (4)] occurs to the E-form (2).
N bonds of E- and Z-amidines
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