化学式C20H21NO4的化合物(摩尔质量:339.39 g/mol)可以指:

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C20H23NO4
C19H19NO4 C20H21NO4 C21H23NO4
C20H19NO4

C20H21NO3 C20H21NO5
C20H20O4 C20H22N2O4
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