You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named trizinc;[4-methylpentyl(propan-2-yl)-lambda4-sulfanylidene]-dioxido-sulfido-lambda5-phosphane by IUPAC nomenclature, provide its molecular formula.
user
C18H40O4P2S4Zn3
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