You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 6-[5-(4-ethylpiperazin-1-yl)sulfonyl-2-propoxyphenyl]-1-[(3-fluorophenyl)methyl]-7H-imidazo[4,5-g]quinazolin-8-one into molecular formula.
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C31H33FN6O4S
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