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Water has been used efficiently as a solvent for the reaction of barbituric acid, aldehyde and urea or thiourea to yield pyrimido[4,5-d]pyrimidines. This environmentally benign procedure leads to high yields of products of greater purity in a single step using water.doi:10.1515/znb-2007-0518 fatcat:rk274hsoxzfqfiolnwi5n7jhea