You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4,7,9,11-tetraoxo-10-(2,4,6-trimethoxyphenyl)sulfonyloxy-10-aza-4-azoniatricyclo[6.3.0.02,6]undecan-5-yl] 2,4,6-trimethoxybenzenesulfonate is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H29N2O16S2+
assistant