You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 5-[5-[1-(8-amino-1-chloro-2H-imidazo[1,5-a]pyrazin-4-ium-3-yl)ethyl]-3-chloro-2-fluoro-6-propan-2-yloxyphenyl]-1H-pyridin-2-one is given. What is its corresponding molecular formula?
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C22H21Cl2FN5O2+
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