You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-ethoxy-1-[4-[(5-methyl-1,2-oxazol-4-yl)methyl]piperazin-1-yl]ethanone by IUPAC nomenclature, provide its molecular formula.
user
C13H21N3O3
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