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 1-(8-fluoro-2,3,4,5-tetrahydro-1-benzoxepin-5-yl)-3-(4,5,6,7-tetrahydro-1-benzofuran-4-yl)urea .
user
C19H21FN2O3
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