化学式C21H28N2O(摩尔质量:324.468 g/mol)可以指:

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C21H30N2O
C20H26N2O C21H28N2O C22H30N2O
C21H26N2O

C21H28N2 C21H28N2O2
C21H27NO C21H29N3O
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