化学式C4H9N3O2(摩尔质量:131.13 g/mol)可以指:

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C4H11N3O2
C3H7N3O2 C4H9N3O2 C5H11N3O2
C4H7N3O2

C4H9N3O C4H9N3O3
C4H8N2O2 C4H10N4O2
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