You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule tert-butyl N-[2-(7-methoxy-1H-indol-3-yl)ethyl]-N-[(2-methylpropan-2-yl)oxycarbonyl]carbamate into molecular formula.
user
C21H30N2O5
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