You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-[4-[8-amino-1-(1H-indol-2-yl)-2,3-dihydroimidazo[1,5-a]pyrazin-3-yl]piperidin-1-yl]-2-pyridin-4-ylsulfanylethanone into molecular formula.
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C26H27N7OS
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