You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2,4-diamino-5-(4-fluorophenyl)-8-phenyl-7,8,9,10-tetrahydro-5H-pyrimido[4,5-b]quinolin-6-one .
user
C23H20FN5O
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