different between amidine vs diamidine

English

amidine (plural amidines)

(chemistry) any of several classes of organic compound, formally derived from oxoacids by replacement of the hydroxy group with an amino group, and the oxo group with =NR
- i.e R_nX(=O)OH => R_nX(=NR)NR₂ where X is C, S, P etc

di- +? amidine

diamidine (plural diamidines)

(organic chemistry) Any organic compound having two amidine groups, such as pentamidine

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