You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(4-chlorophenyl)ethyl]-2-[(5S,6S)-6-methyl-2,4-dioxo-1,3-diazaspiro[4.5]decan-3-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H24ClN3O3
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