4,6-Dihydroxy-5-methoxypyrimidine5193-84-033 % similar 5-Bromo-4,6-dihydroxypyrimidine15726-38-233 % similar 1-Methyluracil615-77-033 % similar 1,3-Dimethyluric acid944-73-031 % similar 4,6-Dihydroxy-5-formylpyrimidine14256-99-631 % similar