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 [8-chloro-6-(2-fluorophenyl)-1,2-dimethyl-4H-imidazo[1,2-a][1,4]benzodiazepin-4-yl] acetate .
user
C21H17ClFN3O2
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