You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[1-(4-oxo-4-thiophen-2-ylbutyl)-1-azoniabicyclo[2.2.2]octan-2-yl] N-butyl-N-phenylcarbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H35N2O3S+
assistant