You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-[[1,3-benzodioxol-5-ylmethyl(2-hydroxypropyl)amino]methyl]-1,3-dimethylbenzimidazol-2-one by IUPAC nomenclature, provide its molecular formula.
user
C21H25N3O4
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