You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[6-chloro-5-methyl-2-oxo-1-(trifluoromethyl)-3H-imidazo[1,2-a]benzimidazol-1-yl]-3-cyclopentylpropanamide into molecular formula.
user
C19H20ClF3N4O2
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