化学式C4H4N2O3(摩尔质量:128.09 g/mol)可以指:

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C4H6N2O3
C3H2N2O3 C4H4N2O3 C5H6N2O3
C4H2N2O3

C4H4N2O2 C4H4N2O4
C4H3NO3 C4H5N3O3
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