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 7-[2-(3-fluorophenyl)pyridin-4-yl]-3,4-dihydro-2H-pyrrolo[1,2-a]pyrazin-1-one;hydrochloride ?
user
C18H15ClFN3O
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