化学式C13H20N2O2(摩尔质量:236.31 g/mol)可以指:

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C13H22N2O2
C12H18N2O2 C13H20N2O2 C14H22N2O2
C13H18N2O2

C13H20N2O C13H20N2O3
C13H19NO2 C13H21N3O2
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