You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[5-(2-chlorophenyl)tetrazol-2-yl]-N-[(1S)-1-(3,4-dimethylphenyl)ethyl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C19H20ClN5O
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