You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-(4-iodophenoxy)-1-(2,3,4,5-tetrahydro-1H-[1,4]diazepino[1,7-a]indol-11-yl)ethanone .
user
C20H19IN2O2
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