Amidinium

Amidinium cations are positively charged organic chemical compounds which can be represented by the chemical formula H
2N=CH–NH+
2. Substituted version (where the N's are substituted with groups other than H) are known as formamidinium salts.^[1]

References

1. Schrader, Thomas; Hamilton, Andrew D., eds. (2005). Functional synthetic receptors. Wiley-VCH. p. 132. ISBN 3-527-30655-2.