化学式C21H22N2O3(摩尔质量350.41 g/mol)可以指:

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C21H24N2O3
C20H20N2O3 C21H22N2O3 C22H24N2O3
C21H20N2O3

C21H22N2O2 C21H22N2O4
C21H21NO3 C21H23N3O3
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