prov:value
| - Such compounds include, for example, monomeric nitrogen compounds such as urea, thiourea, substituted ureas and thioureas, dicyandiamide, dicyandiamidine, biguanides, amides, carbamates, allophanates and heterocyclic compounds such as aminotriazines, urons ureins, ureides, imidazolidones, triazones and hydantoins, or mixtures of such compounds, and polymeric nitrogen compounds such as the polymeri
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