You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-cyclopropyl-N-[(2-fluorophenyl)methyl]-2-(12-oxo-7-thia-9,11-diazatricyclo[6.4.0.02,6]dodeca-1(8),2(6),9-trien-11-yl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H20FN3O2S
assistant