化学式C21H18N2O5(摩尔质量:378.38 g/mol)可以指:

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C21H20N2O5
C20H16N2O5 C21H18N2O5 C22H20N2O5
C21H16N2O5

C21H18N2O4 C21H18N2O6
C21H17NO5 C21H19N3O5
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