You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(2-fluorophenyl)-2-[(11-phenyl-3,4,6,9,10-pentazatricyclo[7.3.0.02,6]dodeca-1(12),2,4,7,10-pentaen-5-yl)sulfanyl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C21H15FN6OS
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