化学式C19H21N3O(摩尔质量:307.397 g/mol)可能指:

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C19H23N3O
C18H19N3O C19H21N3O C20H23N3O
C19H19N3O

C19H21N3 C19H21N3O2
C19H20N2O C19H22N4O
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