You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2-ethylimidazol-1-yl)-6-[(2S)-1-[(3-methylimidazol-4-yl)methyl]pyrrolidin-2-yl]pyridine is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H24N6
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