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-[2-(7-chlorospiro[2H-indole-3,1'-cyclopentane]-1-yl)-2-oxoethyl]-3-methylpyrimidine-2,4-dione .
user
C19H20ClN3O3
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