You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 4-[5-[[(1S,2S,4R,5R)-7-[2,2-bis(furan-2-yl)-2-hydroxyacetyl]oxy-9-methyl-3-oxa-9-azoniatricyclo[3.3.1.02,4]nonan-9-yl]methyl]thiophen-2-yl]butanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C29H34NO8S+
assistant