You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named azetidin-1-yl-[2-[(8-methylimidazo[1,2-a]pyridin-2-yl)methoxy]phenyl]methanone by IUPAC nomenclature, provide its molecular formula.
user
C19H19N3O2
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