You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [7-[(2-chlorophenyl)methyl]-1,3-dioxo-5,6,8,8a-tetrahydroimidazo[1,5-a]pyrazin-2-yl] 4-(4-methoxyphenyl)piperazine-1-carboxylate by IUPAC nomenclature, provide its molecular formula.
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C25H28ClN5O5
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