化学式C2H2N2O2(摩尔质量:86.049 g/mol)可以指:

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C2H4N2O2
CN2O2 C2H2N2O2 C3H4N2O2
C2N2O2

C2H2N2O C2H2N2O3
C2HNO2 C2H3N3O2
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