You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (5S)-7-methyl-2-[(2-oxo-1,3-dihydrobenzimidazol-5-yl)sulfonyl]-2,7-diazaspiro[4.5]decan-6-one into its molecular formula.
user
C16H20N4O4S
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