You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named phenyl 2-[4-(1,3-benzodioxol-5-ylmethyl)piperazine-1,4-diium-1-yl]ethanesulfonate by IUPAC nomenclature, provide its molecular formula.
user
C20H26N2O5S+2
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