You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 8-[[4-(2-hydroxyethyl)piperazin-1-ium-1-yl]methyl]-3-(4-methoxyphenyl)-2-oxochromen-7-olate by IUPAC nomenclature, provide its molecular formula.
user
C23H26N2O5
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