化学式C21H28N2O2(摩尔质量:340.467 g/mol)可以指:

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C21H30N2O2
C20H26N2O2 C21H28N2O2 C22H30N2O2
C21H26N2O2

C21H28N2O C21H28N2O3
C21H27NO2 C21H29N3O2
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