You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-3-(2-chloroimidazo[1,2-a]pyridin-3-yl)-1-(3-methylpiperidin-1-yl)prop-2-en-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H18ClN3O
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