You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(6,7-dihydro-1H-[1,4]dioxino[2,3-f]benzimidazol-2-ylsulfanyl)-2-methylpropanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H14N2O4S
assistant