化学式C9H12N2O3(摩尔质量:196.20 g/mol)可以指:

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C9H14N2O3
C8H10N2O3 C9H12N2O3 C10H14N2O3
C9H10N2O3

C9H12N2O2 C9H12N2O4
C9H11NO3 C9H13N3O3
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