You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(2S)-2-(1-methylpyrrol-2-yl)azepan-1-yl]-2-(1,3,5-trimethylpyrazol-4-yl)oxyethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H28N4O2
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