hydrogenchloride; sulfuric acid; nitric acid; zinc nitro-compound obtained by treatment with a mixture of HNO3 and H2SO4; redn. with Zn-powder in concd. HCl; addn. of benzaldehyde at ambient temp.; hydrolysis of semicarbazone with concd. HCl;

hydrogenchloride; sodium ethanolate the intermediate 4-(4,6-dihydroxy-pyrimidyl-(2))-semicarbazide hydrochloride is decomposed with concd. HCl;