You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 8-(8-amino-1-bromoimidazo[1,5-a]pyrazin-3-yl)-2-oxa-8-azaspiro[4.5]decan-1-one into molecular formula.
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C14H16BrN5O2
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