You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[(2S)-1-[5-(7-methoxy-3,4-dihydro-2H-1,5-benzodioxepin-8-yl)imidazol-1-yl]propan-2-yl]piperidine into its molecular formula.
user
C21H29N3O3
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