You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (2-methylfuran-3-yl)-[(3R,4S)-3-(1-methylimidazol-4-yl)-4-(pyrimidin-2-ylamino)pyrrolidin-1-yl]methanone ?
user
C18H20N6O2
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