You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name tert-butyl N-[2-[[3-[[(E)-4,4-dimethylpent-2-enoyl]amino]phenyl]methylamino]-2-oxoethyl]carbamate into its molecular formula.
user
C21H31N3O4
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