You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-(8-ethynyl-7-methoxy-3-methyl-2-oxoimidazo[4,5-c]quinolin-1-yl)-3,5-difluorobenzonitrile;molecular hydrogen .
user
C21H14F2N4O2
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