化学式C19H28N4O2(摩尔质量:344.459 g/mol)可以指:

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C19H30N4O2
C18H26N4O2 C19H28N4O2 C20H30N4O2
C19H26N4O2

C19H28N4O C19H28N4O3
C19H27N3O2 C19H29N5O2
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