You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-methyl-5-[[6-[(3-methyl-4-oxo-2-sulfanylidene-1,3-oxazolidin-5-ylidene)methyl]-9-phenylcarbazol-3-yl]methylidene]-2-sulfanylidene-1,3-oxazolidin-4-one by IUPAC nomenclature, provide its molecular formula.
user
C28H19N3O4S2
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