You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named dimethyl-octadecyl-[3-[tris[2-[2-hydroxyethyl-(2-hydroxy-3-sulfopropyl)amino]ethoxy]silyl]propyl]azanium by IUPAC nomenclature, provide its molecular formula.
user
C44H97N4O18S3Si+
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