[Structure and antipyretic-hypothermizing effect of various pyrazol/1,5-a/pyrimidines].

Structures of condensation products between 3-phenyl-5-aminopyrazole and ethyl ethoxymethylenacetoacetate and ethyl acetonoxalate are demonstrated, namely ethyl 2-phenyl-7-methylpyrazolo[1,5-a]pyrimidin-6-carboxylate and ethyl 2-phenyl-7-methylpyrazolo[1,5-a]pyrimidin-5-carboxylate. Studies on antipyretic and hypothermizing activity of the acid derived from the latter and of other compounds are reported.