You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-phenyl-3-[2-[2-(1,5,5-trihydroxypiperidin-2-yl)ethylsulfanyl]ethyl]urea;hydrochloride by IUPAC nomenclature, provide its molecular formula.
user
C16H26ClN3O4S
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