化学式C20H18N2O(摩尔质量:302.369 g/mol)可以指:

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C20H20N2O
C19H16N2O C20H18N2O C21H20N2O
C20H16N2O

C20H18N2 C20H18N2O2
C20H17NO C20H19N3O
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