化学式C20H20N2O2(摩尔质量:320.385 g/mol)可以指:

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C20H22N2O2
C19H18N2O2 C20H20N2O2 C21H22N2O2
C20H18N2O2

C20H20N2O C20H20N2O3
C20H19NO2 C20H21N3O2
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