化学式C4H4N2O2(摩尔质量:112.088 g/mol)可以指:

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C4H6N2O2
C3H2N2O2 C4H4N2O2 C5H6N2O2
C4H2N2O2

C4H4N2O C4H4N2O3
C4H3NO2 C4H5N3O2
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