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 (Z)-3-amino-4-[tert-butyl(2,2,2-trifluoroethyl)amino]-N-[6-methyl-3-(1H-pyrazol-4-yl)imidazo[1,2-a]pyrazin-8-yl]but-2-enethioamide is given. What is its corresponding molecular formula?
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C20H25F3N8S
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