You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 5-[[(2S)-4-hydroxybutan-2-yl]amino]-1-(2-methoxyethyl)-3-(3-methylbutanoylamino)pyrrolo[2,3-b]pyridine-2-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H32N4O5
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