化学式C12H20N4O2(摩尔质量:252.31 g/mol)可以指:

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C12H22N4O2
C11H18N4O2 C12H20N4O2 C13H22N4O2
C12H18N4O2

C12H20N4O C12H20N4O3
C12H19N3O2 C12H21N5O2
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