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- [29] PYRIMIDINE-DERIVATIVES AND RELATED-COMPOUNDS .41. REACTIONS OF 1,3,6-TRIMETHYL-5-NITROURACIL AND ITS 6-BROMOMETHYL ANALOG WITH AMINES AND HYDRAZINES - SYNTHESIS OF PYRAZOLO[4,3-D]PYRIMIDINE N-OXIDES AND THEIR RING EXPANSION TO PYRIMIDO[5,4-D]PYRIMIDINES JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1, 1982, (01): : 277 - 284