You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-chloro-4-[2-[4-(5,5-dimethyl-1,4-dihydroimidazol-2-yl)phenyl]ethynyl]isoquinolin-3-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H19ClN4
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