Fulminic acid is an acid with the formula HCNO, more specifically H\sC\tN+\sO-. It is an isomer of isocyanic acid (H\sN\dC\dO) and of its elusive tautomer, cyanic acid (H\sO\sC\tN), and also of isofulminic acid (H\sO\sN+\tC-).
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