Derivatives of oxoacids RnE(=O)OH in which the hydroxy group is replaced by an amino group and the oxo group is replaced by =NR. Amidines include carboxamidines, sulfinamidines and phosphinamidines, R2P(=NR)NR2. In organic chemistry an unspecified amidine is commonly a carboxamidine. See also carboxamidines, sulfinamidines.
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