化学式C5H4N2O2(摩尔质量:124.1 g/mol)可以指:

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C5H6N2O2
C4H2N2O2 C5H4N2O2 C6H6N2O2
C5H2N2O2

C5H4N2O C5H4N2O3
C5H3NO2 C5H5N3O2
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