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Formulas which begin with C₄H₅N₅O

All formulas are in Hill order.

• C₄H₅N₅O (Imidazole-4(or 5)-carboxamide, 5(or 4)-diazo-4,5-dihydro-)
• C₄H₅N₅O₂ (7H-imidazo[4,5-d]-v-triazin-4-one, hydrate)
• C₄H₅N₅O₃______ (2 species)