化学式C20H26N4O2(摩尔质量:354.446 g/mol)可以指:

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C20H28N4O2
C19H24N4O2 C20H26N4O2 C21H28N4O2
C20H24N4O2

C20H26N4O C20H26N4O3
C20H25N3O2 C20H27N5O2
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