You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,4R)-4-[(5-cyanopyridin-2-yl)amino]-2-methyl-1-[(2-methylpropan-2-yl)oxycarbonyl]pyrrolidine-2-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H22N4O4
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