You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[2-amino-4-(2-ethoxy-2-oxoethyl)-1,3-thiazol-3-ium-3-yl]butane-1-sulfonic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C11H19N2O5S2+
assistant