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 5-[2-chloro-5-[(2,5-difluorophenyl)methoxy]phenyl]-4,6-dioxo-7H-thieno[3,4-c]pyridine-3-carboxylic acid ?
user
C21H12ClF2NO5S
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