Reaction of dicyandiamide with series of amino acids afforded guanidinyl pyrazolones 2–19, respectively. Although reaction of dicyandiamide with urea, acetamide, bezamide, allantion, p-aminobenzoic acid, sulphanilic acid, and adenine gave biguanides 20–26, respectively. All compounds have been characterized on the basis of IR and 1H-NMR.
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