You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N-[1-chloro-2-(4-chlorophenyl)ethyl]-2-[4-[1-chloro-2-(4-chlorophenyl)ethyl]-1-(3-morpholin-4-ylpropyl)-3,6-dioxopiperazin-2-yl]-N-(1-oxobutan-2-yl)acetamide by IUPAC nomenclature, provide its molecular formula.
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C33H40Cl4N4O5
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