You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-[[1-[[(2-methoxycarbonylphenyl)sulfonylamino]methyl]-3,4-dihydro-1H-isochromen-6-yl]oxy]acetic acid .
user
C20H21NO8S
assistant