Abstract
A mixture of carbon monoxide, nitrogen and water was irradiated with high energy protons, and nucleic acid bases and related compounds in the products were analyzed. The irradiation product was separated, fractionated, and desalted by high performance liquid chromatography. Compounds in each fraction was identified by liquid ionization mass spectrometry. Uracil, one of the pyrimidine bases, and dihydrouracil were identified by the present method, and existence of some other bases were also suggested
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