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 (3aR,6aS)-7'-ethyl-1-(2-methylsulfanylethyl)-5-(2-phenylethyl)spiro[1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3,3'-1H-indole]-2',4,6-trione is given. What is its corresponding molecular formula?
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C26H29N3O3S
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