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 3-[2-(2,5-difluorophenyl)ethynyl]-2-[(3-methoxynaphthalen-2-yl)methoxy]pyrido[2,3-b]pyrazine ?
user
C27H17F2N3O2
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