You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(3R,4S)-1-[2-(6-methylpyridin-2-yl)ethyl]-4-(2H-triazol-4-yl)pyrrolidin-3-yl]acetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H21N5O2
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