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Formulas which begin with C₄H₄N₂O₄

All formulas are in Hill order.

• C₄H₄N₂O₄ (1-Nitro-2,5-pyrrolidine-dione)
• C₄H₄N₂O₄ (2,4,6(1H,3H,5H)-Pyrimidinetrione, 5-hydroxy-)