You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (2S)-4-[[3-(4-chloro-3-fluorophenyl)-1,2,4-oxadiazol-5-yl]methyl]-2-methyl-1,4-benzoxazin-3-one .
user
C18H13ClFN3O3
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