You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named S-[2-[(benzylamino)-[[(2R,3R,4R,5R)-3,4-dihydroxy-4-methyl-5-(2-oxo-4-pyrrolidin-1-ylpyrimidin-1-yl)oxolan-2-yl]methoxy]phosphoryl]oxyethyl] 2-(hydroxymethyl)prop-2-enethioate by IUPAC nomenclature, provide its molecular formula.
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C27H37N4O9PS
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