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.