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Formulas which begin with C₅H₄N₄O

All formulas are in Hill order.

• C₅H₄N₄O (Allopurinol)
• C₅H₄N₄O (6H-Purin-6-one, 1,7-dihydro-)
• C₅H₄N₄O (7H-Pyrazolo[4,3-d]pyrimidin-7-one, 1,4-dihydro-)
• C₅H₄N₄OS______ (2 species)
• C₅H₄N₄O₂______ (3 species)
• C₅H₄N₄O₃ (Uric acid)
• C₅H₄N₄O₄ (4-Pyridinamine, 3,5-dinitro-)