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 [3-methyl-5-(trifluoromethyl)phenyl]methyl (6S,9aS)-8-benzyl-6-[2-(4-methylpiperazin-1-yl)-2-oxoethyl]-4,7-dioxo-3,6,9,9a-tetrahydro-2H-pyrazino[1,2-a]pyrimidine-1-carboxylate is given. What is its corresponding molecular formula?
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C31H36F3N5O5
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